diff --git a/core/io/packet_peer.cpp b/core/io/packet_peer.cpp
index b6cc5bf42a..3da494a8ef 100644
--- a/core/io/packet_peer.cpp
+++ b/core/io/packet_peer.cpp
@@ -151,11 +151,6 @@ void PacketPeer::_bind_methods() {
 
 /***************/
 
-void PacketPeerStream::_set_stream_peer(REF p_peer) {
-	ERR_FAIL_COND_MSG(p_peer.is_null(), "It's not a reference to a valid Resource object.");
-	set_stream_peer(p_peer);
-}
-
 void PacketPeerStream::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_stream_peer", "peer"), &PacketPeerStream::set_stream_peer);
 	ClassDB::bind_method(D_METHOD("get_stream_peer"), &PacketPeerStream::get_stream_peer);
@@ -263,10 +258,8 @@ int PacketPeerStream::get_max_packet_size() const {
 }
 
 void PacketPeerStream::set_stream_peer(const Ref<StreamPeer> &p_peer) {
-	//ERR_FAIL_COND(p_peer.is_null());
-
 	if (p_peer.ptr() != peer.ptr()) {
-		ring_buffer.advance_read(ring_buffer.data_left()); // reset the ring buffer
+		ring_buffer.advance_read(ring_buffer.data_left()); // Reset the ring buffer.
 	}
 
 	peer = p_peer;
diff --git a/core/io/packet_peer.h b/core/io/packet_peer.h
index f7f080aa43..a25fa03875 100644
--- a/core/io/packet_peer.h
+++ b/core/io/packet_peer.h
@@ -86,7 +86,6 @@ class PacketPeerStream : public PacketPeer {
 	Error _poll_buffer() const;
 
 protected:
-	void _set_stream_peer(REF p_peer);
 	static void _bind_methods();
 
 public:
diff --git a/core/io/resource_importer.cpp b/core/io/resource_importer.cpp
index c88331cf9e..9b14d2c763 100644
--- a/core/io/resource_importer.cpp
+++ b/core/io/resource_importer.cpp
@@ -192,10 +192,6 @@ bool ResourceFormatImporter::recognize_path(const String &p_path, const String &
 	return FileAccess::exists(p_path + ".import");
 }
 
-bool ResourceFormatImporter::can_be_imported(const String &p_path) const {
-	return ResourceFormatLoader::recognize_path(p_path);
-}
-
 int ResourceFormatImporter::get_import_order(const String &p_path) const {
 	Ref<ResourceImporter> importer;
 
diff --git a/core/io/resource_importer.h b/core/io/resource_importer.h
index 30bbd43c18..1b300bf656 100644
--- a/core/io/resource_importer.h
+++ b/core/io/resource_importer.h
@@ -70,7 +70,6 @@ public:
 	virtual String get_import_group_file(const String &p_path) const;
 	virtual bool exists(const String &p_path) const;
 
-	virtual bool can_be_imported(const String &p_path) const;
 	virtual int get_import_order(const String &p_path) const;
 
 	String get_internal_resource_path(const String &p_path) const;
diff --git a/core/math/vector3.cpp b/core/math/vector3.cpp
index 23f5bb88fe..09354d8e79 100644
--- a/core/math/vector3.cpp
+++ b/core/math/vector3.cpp
@@ -72,39 +72,6 @@ Vector3 Vector3::snapped(Vector3 p_val) const {
 	return v;
 }
 
-Vector3 Vector3::cubic_interpolaten(const Vector3 &p_b, const Vector3 &p_pre_a, const Vector3 &p_post_b, real_t p_weight) const {
-	Vector3 p0 = p_pre_a;
-	Vector3 p1 = *this;
-	Vector3 p2 = p_b;
-	Vector3 p3 = p_post_b;
-
-	{
-		//normalize
-
-		real_t ab = p0.distance_to(p1);
-		real_t bc = p1.distance_to(p2);
-		real_t cd = p2.distance_to(p3);
-
-		if (ab > 0) {
-			p0 = p1 + (p0 - p1) * (bc / ab);
-		}
-		if (cd > 0) {
-			p3 = p2 + (p3 - p2) * (bc / cd);
-		}
-	}
-
-	real_t t = p_weight;
-	real_t t2 = t * t;
-	real_t t3 = t2 * t;
-
-	Vector3 out;
-	out = 0.5 * ((p1 * 2.0) +
-						(-p0 + p2) * t +
-						(2.0 * p0 - 5.0 * p1 + 4.0 * p2 - p3) * t2 +
-						(-p0 + 3.0 * p1 - 3.0 * p2 + p3) * t3);
-	return out;
-}
-
 Vector3 Vector3::cubic_interpolate(const Vector3 &p_b, const Vector3 &p_pre_a, const Vector3 &p_post_b, real_t p_weight) const {
 	Vector3 p0 = p_pre_a;
 	Vector3 p1 = *this;
diff --git a/core/math/vector3.h b/core/math/vector3.h
index 69e79627f3..5af84377fd 100644
--- a/core/math/vector3.h
+++ b/core/math/vector3.h
@@ -89,7 +89,6 @@ struct Vector3 {
 	_FORCE_INLINE_ Vector3 lerp(const Vector3 &p_to, real_t p_weight) const;
 	_FORCE_INLINE_ Vector3 slerp(const Vector3 &p_to, real_t p_weight) const;
 	Vector3 cubic_interpolate(const Vector3 &p_b, const Vector3 &p_pre_a, const Vector3 &p_post_b, real_t p_weight) const;
-	Vector3 cubic_interpolaten(const Vector3 &p_b, const Vector3 &p_pre_a, const Vector3 &p_post_b, real_t p_weight) const;
 	Vector3 move_toward(const Vector3 &p_to, const real_t p_delta) const;
 
 	_FORCE_INLINE_ Vector3 cross(const Vector3 &p_b) const;
diff --git a/core/object/object.cpp b/core/object/object.cpp
index 3764316122..681e1188ff 100644
--- a/core/object/object.cpp
+++ b/core/object/object.cpp
@@ -823,10 +823,6 @@ void Object::property_list_changed_notify() {
 	_change_notify();
 }
 
-void Object::cancel_delete() {
-	_predelete_ok = true;
-}
-
 void Object::set_script_and_instance(const Variant &p_script, ScriptInstance *p_instance) {
 	//this function is not meant to be used in any of these ways
 	ERR_FAIL_COND(p_script.is_null());
diff --git a/core/object/object.h b/core/object/object.h
index 5bf9600c5a..dc004f38a9 100644
--- a/core/object/object.h
+++ b/core/object/object.h
@@ -525,8 +525,6 @@ protected:
 	static void get_valid_parents_static(List<String> *p_parents);
 	static void _get_valid_parents_static(List<String> *p_parents);
 
-	void cancel_delete();
-
 	virtual void _changed_callback(Object *p_changed, const char *p_prop);
 
 	//Variant _call_bind(const StringName& p_name, const Variant& p_arg1 = Variant(), const Variant& p_arg2 = Variant(), const Variant& p_arg3 = Variant(), const Variant& p_arg4 = Variant());
diff --git a/core/object/script_language.h b/core/object/script_language.h
index ddd884a4f3..f5d65cf42d 100644
--- a/core/object/script_language.h
+++ b/core/object/script_language.h
@@ -274,8 +274,6 @@ class ScriptCodeCompletionCache {
 	static ScriptCodeCompletionCache *singleton;
 
 public:
-	virtual RES get_cached_resource(const String &p_path) = 0;
-
 	static ScriptCodeCompletionCache *get_singleton() { return singleton; }
 
 	ScriptCodeCompletionCache();
diff --git a/editor/animation_track_editor.cpp b/editor/animation_track_editor.cpp
index 717e4628ae..7411af2280 100644
--- a/editor/animation_track_editor.cpp
+++ b/editor/animation_track_editor.cpp
@@ -2217,10 +2217,6 @@ void AnimationTrackEdit::draw_bg(int p_clip_left, int p_clip_right) {
 void AnimationTrackEdit::draw_fg(int p_clip_left, int p_clip_right) {
 }
 
-void AnimationTrackEdit::draw_texture_clipped(const Ref<Texture2D> &p_texture, const Vector2 &p_pos) {
-	draw_texture_region_clipped(p_texture, Rect2(p_pos, p_texture->get_size()), Rect2(Point2(), p_texture->get_size()));
-}
-
 void AnimationTrackEdit::draw_texture_region_clipped(const Ref<Texture2D> &p_texture, const Rect2 &p_rect, const Rect2 &p_region) {
 	int clip_left = timeline->get_name_limit();
 	int clip_right = get_size().width - timeline->get_buttons_width();
diff --git a/editor/animation_track_editor.h b/editor/animation_track_editor.h
index 5e12791e34..3cb31fe21e 100644
--- a/editor/animation_track_editor.h
+++ b/editor/animation_track_editor.h
@@ -207,7 +207,6 @@ public:
 	virtual void draw_fg(int p_clip_left, int p_clip_right);
 
 	//helper
-	void draw_texture_clipped(const Ref<Texture2D> &p_texture, const Vector2 &p_pos);
 	void draw_texture_region_clipped(const Ref<Texture2D> &p_texture, const Rect2 &p_rect, const Rect2 &p_region);
 	void draw_rect_clipped(const Rect2 &p_rect, const Color &p_color, bool p_filled = true);
 
diff --git a/editor/editor_data.cpp b/editor/editor_data.cpp
index 975405aec4..eab1ecf373 100644
--- a/editor/editor_data.cpp
+++ b/editor/editor_data.cpp
@@ -691,11 +691,6 @@ void EditorData::set_edited_scene_version(uint64_t version, int p_scene_idx) {
 	}
 }
 
-uint64_t EditorData::get_edited_scene_version() const {
-	ERR_FAIL_INDEX_V(current_edited_scene, edited_scene.size(), 0);
-	return edited_scene[current_edited_scene].version;
-}
-
 uint64_t EditorData::get_scene_version(int p_idx) const {
 	ERR_FAIL_INDEX_V(p_idx, edited_scene.size(), 0);
 	return edited_scene[p_idx].version;
diff --git a/editor/editor_data.h b/editor/editor_data.h
index e4ef9f56a5..0d27e06987 100644
--- a/editor/editor_data.h
+++ b/editor/editor_data.h
@@ -190,7 +190,6 @@ public:
 	void set_scene_path(int p_idx, const String &p_path);
 	Ref<Script> get_scene_root_script(int p_idx) const;
 	void set_edited_scene_version(uint64_t version, int p_scene_idx = -1);
-	uint64_t get_edited_scene_version() const;
 	uint64_t get_scene_version(int p_idx) const;
 	void clear_edited_scenes();
 	void set_edited_scene_live_edit_root(const NodePath &p_root);
diff --git a/editor/editor_export.cpp b/editor/editor_export.cpp
index f7cb5428ce..07318c14bc 100644
--- a/editor/editor_export.cpp
+++ b/editor/editor_export.cpp
@@ -1835,17 +1835,10 @@ void EditorExportPlatformPC::set_debug_32(const String &p_file) {
 	debug_file_32 = p_file;
 }
 
-void EditorExportPlatformPC::add_platform_feature(const String &p_feature) {
-	extra_features.insert(p_feature);
-}
-
 void EditorExportPlatformPC::get_platform_features(List<String> *r_features) {
 	r_features->push_back("pc"); //all pcs support "pc"
 	r_features->push_back("s3tc"); //all pcs support "s3tc" compression
 	r_features->push_back(get_os_name()); //OS name is a feature
-	for (Set<String>::Element *E = extra_features.front(); E; E = E->next()) {
-		r_features->push_back(E->get());
-	}
 }
 
 void EditorExportPlatformPC::resolve_platform_feature_priorities(const Ref<EditorExportPreset> &p_preset, Set<String> &p_features) {
diff --git a/editor/editor_export.h b/editor/editor_export.h
index 6f835f5a68..584ef17035 100644
--- a/editor/editor_export.h
+++ b/editor/editor_export.h
@@ -424,8 +424,6 @@ private:
 	String debug_file_32;
 	String debug_file_64;
 
-	Set<String> extra_features;
-
 	int chmod_flags;
 
 	FixUpEmbeddedPckFunc fixup_embedded_pck_func;
diff --git a/editor/editor_file_system.cpp b/editor/editor_file_system.cpp
index 738b88a86b..43f0c9e2bb 100644
--- a/editor/editor_file_system.cpp
+++ b/editor/editor_file_system.cpp
@@ -1044,10 +1044,6 @@ void EditorFileSystem::_thread_func_sources(void *_userdata) {
 	efs->scanning_changes_done = true;
 }
 
-void EditorFileSystem::get_changed_sources(List<String> *r_changed) {
-	*r_changed = sources_changed;
-}
-
 void EditorFileSystem::scan_changes() {
 	if (first_scan || // Prevent a premature changes scan from inhibiting the first full scan
 			scanning || scanning_changes || thread) {
diff --git a/editor/editor_file_system.h b/editor/editor_file_system.h
index f89b4db933..a7ab4d6a9a 100644
--- a/editor/editor_file_system.h
+++ b/editor/editor_file_system.h
@@ -248,7 +248,6 @@ public:
 	float get_scanning_progress() const;
 	void scan();
 	void scan_changes();
-	void get_changed_sources(List<String> *r_changed);
 	void update_file(const String &p_file);
 
 	EditorFileSystemDirectory *get_filesystem_path(const String &p_path);
diff --git a/editor/editor_node.cpp b/editor/editor_node.cpp
index cff4098eea..f3086d416b 100644
--- a/editor/editor_node.cpp
+++ b/editor/editor_node.cpp
@@ -175,7 +175,6 @@
 #include "editor/pvrtc_compress.h"
 #include "editor/quick_open.h"
 #include "editor/register_exporters.h"
-#include "editor/run_settings_dialog.h"
 #include "editor/settings_config_dialog.h"
 #include "scene/main/window.h"
 #include "servers/display_server.h"
@@ -2557,9 +2556,6 @@ void EditorNode::_menu_option_confirm(int p_option, bool p_confirmed) {
 			run_play_current();
 
 		} break;
-		case RUN_SCENE_SETTINGS: {
-			run_settings_dialog->popup_run_settings();
-		} break;
 		case RUN_SETTINGS: {
 			project_settings->popup_project_settings();
 		} break;
@@ -4836,16 +4832,6 @@ Button *EditorNode::add_bottom_panel_item(String p_text, Control *p_item) {
 	return tb;
 }
 
-bool EditorNode::are_bottom_panels_hidden() const {
-	for (int i = 0; i < bottom_panel_items.size(); i++) {
-		if (bottom_panel_items[i].button->is_pressed()) {
-			return false;
-		}
-	}
-
-	return true;
-}
-
 void EditorNode::hide_bottom_panel() {
 	for (int i = 0; i < bottom_panel_items.size(); i++) {
 		if (bottom_panel_items[i].control->is_visible()) {
@@ -6091,9 +6077,6 @@ EditorNode::EditorNode() {
 	project_settings = memnew(ProjectSettingsEditor(&editor_data));
 	gui_base->add_child(project_settings);
 
-	run_settings_dialog = memnew(RunSettingsDialog);
-	gui_base->add_child(run_settings_dialog);
-
 	export_template_manager = memnew(ExportTemplateManager);
 	gui_base->add_child(export_template_manager);
 
diff --git a/editor/editor_node.h b/editor/editor_node.h
index 066c2caea7..b727bce1e4 100644
--- a/editor/editor_node.h
+++ b/editor/editor_node.h
@@ -161,7 +161,6 @@ private:
 		RUN_STOP,
 		RUN_PLAY_SCENE,
 		RUN_PLAY_CUSTOM_SCENE,
-		RUN_SCENE_SETTINGS,
 		RUN_SETTINGS,
 		RUN_PROJECT_DATA_FOLDER,
 		RUN_PROJECT_MANAGER,
@@ -312,7 +311,6 @@ private:
 	ConfirmationDialog *remove_android_build_template;
 
 	EditorSettingsDialog *settings_config_dialog;
-	RunSettingsDialog *run_settings_dialog;
 	ProjectSettingsEditor *project_settings;
 	PopupMenu *vcs_actions_menu;
 	EditorFileDialog *file;
@@ -824,7 +822,6 @@ public:
 	Button *get_pause_button() { return pause_button; }
 
 	Button *add_bottom_panel_item(String p_text, Control *p_item);
-	bool are_bottom_panels_hidden() const;
 	void make_bottom_panel_item_visible(Control *p_item);
 	void raise_bottom_panel_item(Control *p_item);
 	void hide_bottom_panel();
diff --git a/editor/editor_settings.cpp b/editor/editor_settings.cpp
index 757e26f308..cc04ea5a58 100644
--- a/editor/editor_settings.cpp
+++ b/editor/editor_settings.cpp
@@ -1539,11 +1539,6 @@ Ref<Shortcut> ED_GET_SHORTCUT(const String &p_path) {
 	return sc;
 }
 
-struct ShortcutMapping {
-	const char *path = nullptr;
-	uint32_t keycode = 0;
-};
-
 Ref<Shortcut> ED_SHORTCUT(const String &p_path, const String &p_name, uint32_t p_keycode) {
 #ifdef OSX_ENABLED
 	// Use Cmd+Backspace as a general replacement for Delete shortcuts on macOS
diff --git a/editor/multi_node_edit.cpp b/editor/multi_node_edit.cpp
index 1077aca7b3..a7d5e5149e 100644
--- a/editor/multi_node_edit.cpp
+++ b/editor/multi_node_edit.cpp
@@ -173,10 +173,6 @@ void MultiNodeEdit::_get_property_list(List<PropertyInfo> *p_list) const {
 	p_list->push_back(PropertyInfo(Variant::OBJECT, "scripts", PROPERTY_HINT_RESOURCE_TYPE, "Script"));
 }
 
-void MultiNodeEdit::clear_nodes() {
-	nodes.clear();
-}
-
 void MultiNodeEdit::add_node(const NodePath &p_node) {
 	nodes.push_back(p_node);
 }
diff --git a/editor/multi_node_edit.h b/editor/multi_node_edit.h
index 3ccf06153d..7f0fb625ef 100644
--- a/editor/multi_node_edit.h
+++ b/editor/multi_node_edit.h
@@ -50,7 +50,6 @@ protected:
 	void _get_property_list(List<PropertyInfo> *p_list) const;
 
 public:
-	void clear_nodes();
 	void add_node(const NodePath &p_node);
 
 	int get_node_count() const;
diff --git a/editor/plugins/animation_tree_editor_plugin.cpp b/editor/plugins/animation_tree_editor_plugin.cpp
index 1bbb68d224..800df12199 100644
--- a/editor/plugins/animation_tree_editor_plugin.cpp
+++ b/editor/plugins/animation_tree_editor_plugin.cpp
@@ -142,9 +142,6 @@ void AnimationTreeEditor::enter_editor(const String &p_path) {
 	edit_path(path);
 }
 
-void AnimationTreeEditor::_about_to_show_root() {
-}
-
 void AnimationTreeEditor::_notification(int p_what) {
 	if (p_what == NOTIFICATION_PROCESS) {
 		ObjectID root;
diff --git a/editor/plugins/animation_tree_editor_plugin.h b/editor/plugins/animation_tree_editor_plugin.h
index 356a078d99..fd3a449487 100644
--- a/editor/plugins/animation_tree_editor_plugin.h
+++ b/editor/plugins/animation_tree_editor_plugin.h
@@ -62,7 +62,6 @@ class AnimationTreeEditor : public VBoxContainer {
 	Vector<AnimationTreeNodeEditorPlugin *> editors;
 
 	void _update_path();
-	void _about_to_show_root();
 	ObjectID current_root;
 
 	void _path_button_pressed(int p_path);
diff --git a/editor/plugins/script_editor_plugin.cpp b/editor/plugins/script_editor_plugin.cpp
index 40ded6872a..5982074750 100644
--- a/editor/plugins/script_editor_plugin.cpp
+++ b/editor/plugins/script_editor_plugin.cpp
@@ -1641,17 +1641,6 @@ void ScriptEditor::get_breakpoints(List<String> *p_breakpoints) {
 	}
 }
 
-void ScriptEditor::ensure_focus_current() {
-	if (!is_inside_tree()) {
-		return;
-	}
-
-	ScriptEditorBase *current = _get_current_editor();
-	if (current) {
-		current->ensure_focus();
-	}
-}
-
 void ScriptEditor::_members_overview_selected(int p_idx) {
 	ScriptEditorBase *se = _get_current_editor();
 	if (!se) {
diff --git a/editor/plugins/script_editor_plugin.h b/editor/plugins/script_editor_plugin.h
index 08c6a2fba7..aafd8cba18 100644
--- a/editor/plugins/script_editor_plugin.h
+++ b/editor/plugins/script_editor_plugin.h
@@ -453,7 +453,6 @@ public:
 
 	bool toggle_scripts_panel();
 	bool is_scripts_panel_toggled();
-	void ensure_focus_current();
 	void apply_scripts() const;
 	void open_script_create_dialog(const String &p_base_name, const String &p_base_path);
 
diff --git a/editor/plugins/theme_editor_plugin.cpp b/editor/plugins/theme_editor_plugin.cpp
index 8ab82b63c3..dd53f60014 100644
--- a/editor/plugins/theme_editor_plugin.cpp
+++ b/editor/plugins/theme_editor_plugin.cpp
@@ -507,13 +507,6 @@ void ThemeEditor::_theme_menu_cbk(int p_option) {
 					theme->set_icon(E->get(), type, import ? base_theme->get_icon(E->get(), type) : Ref<Texture2D>());
 				}
 
-				List<StringName> shaders;
-				base_theme->get_shader_list(type, &shaders);
-
-				for (List<StringName>::Element *E = shaders.front(); E; E = E->next()) {
-					theme->set_shader(E->get(), type, import ? base_theme->get_shader(E->get(), type) : Ref<Shader>());
-				}
-
 				List<StringName> styleboxs;
 				base_theme->get_stylebox_list(type, &styleboxs);
 
diff --git a/editor/run_settings_dialog.cpp b/editor/run_settings_dialog.cpp
deleted file mode 100644
index b6dda4c5bb..0000000000
--- a/editor/run_settings_dialog.cpp
+++ /dev/null
@@ -1,85 +0,0 @@
-/*************************************************************************/
-/*  run_settings_dialog.cpp                                              */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-#include "run_settings_dialog.h"
-
-void RunSettingsDialog::popup_run_settings() {
-	popup_centered(Size2(300, 150));
-}
-
-void RunSettingsDialog::set_custom_arguments(const String &p_arguments) {
-	arguments->set_text(p_arguments);
-}
-
-String RunSettingsDialog::get_custom_arguments() const {
-	return arguments->get_text();
-}
-
-void RunSettingsDialog::_bind_methods() {
-	//ClassDB::bind_method("_browse_selected_file",&RunSettingsDialog::_browse_selected_file);
-}
-
-void RunSettingsDialog::_run_mode_changed(int idx) {
-	if (idx == 0) {
-		arguments->set_editable(false);
-	} else {
-		arguments->set_editable(true);
-	}
-}
-
-int RunSettingsDialog::get_run_mode() const {
-	return run_mode->get_selected();
-}
-
-void RunSettingsDialog::set_run_mode(int p_run_mode) {
-	run_mode->select(p_run_mode);
-	arguments->set_editable(p_run_mode);
-}
-
-RunSettingsDialog::RunSettingsDialog() {
-	/* SNAP DIALOG */
-
-	VBoxContainer *vbc = memnew(VBoxContainer);
-	add_child(vbc);
-	//set_child_rect(vbc);
-
-	run_mode = memnew(OptionButton);
-	vbc->add_margin_child(TTR("Run Mode:"), run_mode);
-	run_mode->add_item(TTR("Current Scene"));
-	run_mode->add_item(TTR("Main Scene"));
-	run_mode->connect("item_selected", callable_mp(this, &RunSettingsDialog::_run_mode_changed));
-	arguments = memnew(LineEdit);
-	vbc->add_margin_child(TTR("Main Scene Arguments:"), arguments);
-	arguments->set_editable(false);
-
-	get_ok()->set_text(TTR("Close"));
-
-	set_title(TTR("Scene Run Settings"));
-}
diff --git a/editor/run_settings_dialog.h b/editor/run_settings_dialog.h
deleted file mode 100644
index 4d6d842de0..0000000000
--- a/editor/run_settings_dialog.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/*************************************************************************/
-/*  run_settings_dialog.h                                                */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-#ifndef RUN_SETTINGS_DIALOG_H
-#define RUN_SETTINGS_DIALOG_H
-
-#include "scene/gui/check_button.h"
-#include "scene/gui/dialogs.h"
-#include "scene/gui/file_dialog.h"
-#include "scene/gui/line_edit.h"
-
-class RunSettingsDialog : public AcceptDialog {
-	GDCLASS(RunSettingsDialog, AcceptDialog);
-
-public:
-	enum RunMode {
-		RUN_LOCAL_SCENE,
-		RUN_MAIN_SCENE,
-	};
-
-private:
-	OptionButton *run_mode;
-	LineEdit *arguments;
-
-	void _run_mode_changed(int idx);
-
-protected:
-	static void _bind_methods();
-
-public:
-	int get_run_mode() const;
-	void set_run_mode(int p_run_mode);
-
-	void set_custom_arguments(const String &p_arguments);
-	String get_custom_arguments() const;
-
-	void popup_run_settings();
-
-	RunSettingsDialog();
-};
-
-#endif // RUN_SETTINGS_DIALOG_H
diff --git a/editor/scene_tree_dock.cpp b/editor/scene_tree_dock.cpp
index 9c37ae584a..91dffb504f 100644
--- a/editor/scene_tree_dock.cpp
+++ b/editor/scene_tree_dock.cpp
@@ -1934,23 +1934,6 @@ void SceneTreeDock::_selection_changed() {
 	_update_script_button();
 }
 
-Node *SceneTreeDock::_get_selection_group_tail(Node *p_node, List<Node *> p_list) {
-	Node *tail = p_node;
-	Node *parent = tail->get_parent();
-
-	for (int i = p_node->get_index(); i < parent->get_child_count(); i++) {
-		Node *sibling = parent->get_child(i);
-
-		if (p_list.find(sibling)) {
-			tail = sibling;
-		} else {
-			break;
-		}
-	}
-
-	return tail;
-}
-
 void SceneTreeDock::_do_create(Node *p_parent) {
 	Object *c = create_dialog->instance_selected();
 
diff --git a/editor/scene_tree_dock.h b/editor/scene_tree_dock.h
index 119a499d0f..2b3593358e 100644
--- a/editor/scene_tree_dock.h
+++ b/editor/scene_tree_dock.h
@@ -203,7 +203,6 @@ class SceneTreeDock : public VBoxContainer {
 	bool _validate_no_foreign();
 	void _selection_changed();
 	void _update_script_button();
-	Node *_get_selection_group_tail(Node *p_node, List<Node *> p_list);
 
 	void _fill_path_renames(Vector<StringName> base_path, Vector<StringName> new_base_path, Node *p_node, List<Pair<NodePath, NodePath>> *p_renames);
 
diff --git a/editor/scene_tree_editor.cpp b/editor/scene_tree_editor.cpp
index 3ec012ce3c..685833da55 100644
--- a/editor/scene_tree_editor.cpp
+++ b/editor/scene_tree_editor.cpp
@@ -829,10 +829,6 @@ void SceneTreeEditor::set_display_foreign_nodes(bool p_display) {
 	_update_tree();
 }
 
-bool SceneTreeEditor::get_display_foreign_nodes() const {
-	return display_foreign;
-}
-
 void SceneTreeEditor::set_valid_types(const Vector<StringName> &p_valid) {
 	valid_types = p_valid;
 }
diff --git a/editor/scene_tree_editor.h b/editor/scene_tree_editor.h
index 9373ef41f9..e2bf9bc41d 100644
--- a/editor/scene_tree_editor.h
+++ b/editor/scene_tree_editor.h
@@ -138,7 +138,6 @@ public:
 
 	void set_undo_redo(UndoRedo *p_undo_redo) { undo_redo = p_undo_redo; };
 	void set_display_foreign_nodes(bool p_display);
-	bool get_display_foreign_nodes() const;
 
 	void set_marked(const Set<Node *> &p_marked, bool p_selectable = false, bool p_children_selectable = true);
 	void set_marked(Node *p_marked, bool p_selectable = false, bool p_children_selectable = true);
diff --git a/platform/server/os_server.cpp b/platform/server/os_server.cpp
index 22af8ba985..f8b420b1c8 100644
--- a/platform/server/os_server.cpp
+++ b/platform/server/os_server.cpp
@@ -49,14 +49,6 @@ const char *OS_Server::get_video_driver_name(int p_driver) const {
 	return "Dummy";
 }
 
-int OS_Server::get_audio_driver_count() const {
-	return 1;
-}
-
-const char *OS_Server::get_audio_driver_name(int p_driver) const {
-	return "Dummy";
-}
-
 int OS_Server::get_current_video_driver() const {
 	return video_driver_index;
 }
diff --git a/platform/server/os_server.h b/platform/server/os_server.h
index bfad89adb8..95b6b5143b 100644
--- a/platform/server/os_server.h
+++ b/platform/server/os_server.h
@@ -70,8 +70,6 @@ protected:
 	virtual int get_video_driver_count() const;
 	virtual const char *get_video_driver_name(int p_driver) const;
 	virtual int get_current_video_driver() const;
-	virtual int get_audio_driver_count() const;
-	virtual const char *get_audio_driver_name(int p_driver) const;
 
 	virtual void initialize_core();
 	virtual Error initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver);
diff --git a/scene/2d/line_builder.cpp b/scene/2d/line_builder.cpp
index f1522dbaeb..e0116d9bad 100644
--- a/scene/2d/line_builder.cpp
+++ b/scene/2d/line_builder.cpp
@@ -459,39 +459,6 @@ void LineBuilder::strip_begin(Vector2 up, Vector2 down, Color color, float uvx)
 	_last_index[DOWN] = vi + 1;
 }
 
-void LineBuilder::strip_new_quad(Vector2 up, Vector2 down, Color color, float uvx) {
-	int vi = vertices.size();
-
-	vertices.push_back(vertices[_last_index[UP]]);
-	vertices.push_back(vertices[_last_index[DOWN]]);
-	vertices.push_back(up);
-	vertices.push_back(down);
-
-	if (_interpolate_color) {
-		colors.push_back(color);
-		colors.push_back(color);
-		colors.push_back(color);
-		colors.push_back(color);
-	}
-
-	if (texture_mode != Line2D::LINE_TEXTURE_NONE) {
-		uvs.push_back(uvs[_last_index[UP]]);
-		uvs.push_back(uvs[_last_index[DOWN]]);
-		uvs.push_back(Vector2(uvx, UP));
-		uvs.push_back(Vector2(uvx, DOWN));
-	}
-
-	indices.push_back(vi);
-	indices.push_back(vi + 3);
-	indices.push_back(vi + 1);
-	indices.push_back(vi);
-	indices.push_back(vi + 2);
-	indices.push_back(vi + 3);
-
-	_last_index[UP] = vi + 2;
-	_last_index[DOWN] = vi + 3;
-}
-
 void LineBuilder::strip_add_quad(Vector2 up, Vector2 down, Color color, float uvx) {
 	int vi = vertices.size();
 
diff --git a/scene/3d/audio_stream_player_3d.cpp b/scene/3d/audio_stream_player_3d.cpp
index b093788d75..37bc032356 100644
--- a/scene/3d/audio_stream_player_3d.cpp
+++ b/scene/3d/audio_stream_player_3d.cpp
@@ -327,9 +327,6 @@ float AudioStreamPlayer3D::_get_attenuation_db(float p_distance) const {
 	return att;
 }
 
-void _update_sound() {
-}
-
 void AudioStreamPlayer3D::_notification(int p_what) {
 	if (p_what == NOTIFICATION_ENTER_TREE) {
 		velocity_tracker->reset(get_global_transform().origin);
diff --git a/scene/gui/control.cpp b/scene/gui/control.cpp
index f9b7d828f4..b471bb9d4e 100644
--- a/scene/gui/control.cpp
+++ b/scene/gui/control.cpp
@@ -223,13 +223,6 @@ bool Control::_set(const StringName &p_name, const Variant &p_value) {
 			}
 			data.icon_override.erase(dname);
 			notification(NOTIFICATION_THEME_CHANGED);
-		} else if (name.begins_with("custom_shaders/")) {
-			String dname = name.get_slicec('/', 1);
-			if (data.shader_override.has(dname)) {
-				data.shader_override[dname]->disconnect("changed", callable_mp(this, &Control::_override_changed));
-			}
-			data.shader_override.erase(dname);
-			notification(NOTIFICATION_THEME_CHANGED);
 		} else if (name.begins_with("custom_styles/")) {
 			String dname = name.get_slicec('/', 1);
 			if (data.style_override.has(dname)) {
@@ -264,9 +257,6 @@ bool Control::_set(const StringName &p_name, const Variant &p_value) {
 		if (name.begins_with("custom_icons/")) {
 			String dname = name.get_slicec('/', 1);
 			add_theme_icon_override(dname, p_value);
-		} else if (name.begins_with("custom_shaders/")) {
-			String dname = name.get_slicec('/', 1);
-			add_theme_shader_override(dname, p_value);
 		} else if (name.begins_with("custom_styles/")) {
 			String dname = name.get_slicec('/', 1);
 			add_theme_style_override(dname, p_value);
@@ -318,9 +308,6 @@ bool Control::_get(const StringName &p_name, Variant &r_ret) const {
 	if (sname.begins_with("custom_icons/")) {
 		String name = sname.get_slicec('/', 1);
 		r_ret = data.icon_override.has(name) ? Variant(data.icon_override[name]) : Variant();
-	} else if (sname.begins_with("custom_shaders/")) {
-		String name = sname.get_slicec('/', 1);
-		r_ret = data.shader_override.has(name) ? Variant(data.shader_override[name]) : Variant();
 	} else if (sname.begins_with("custom_styles/")) {
 		String name = sname.get_slicec('/', 1);
 		r_ret = data.style_override.has(name) ? Variant(data.style_override[name]) : Variant();
@@ -366,18 +353,6 @@ void Control::_get_property_list(List<PropertyInfo> *p_list) const {
 			p_list->push_back(PropertyInfo(Variant::OBJECT, "custom_icons/" + E->get(), PROPERTY_HINT_RESOURCE_TYPE, "Texture2D", hint));
 		}
 	}
-	{
-		List<StringName> names;
-		theme->get_shader_list(get_class_name(), &names);
-		for (List<StringName>::Element *E = names.front(); E; E = E->next()) {
-			uint32_t hint = PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_CHECKABLE;
-			if (data.shader_override.has(E->get())) {
-				hint |= PROPERTY_USAGE_STORAGE | PROPERTY_USAGE_CHECKED;
-			}
-
-			p_list->push_back(PropertyInfo(Variant::OBJECT, "custom_shaders/" + E->get(), PROPERTY_HINT_RESOURCE_TYPE, "Shader,VisualShader", hint));
-		}
-	}
 	{
 		List<StringName> names;
 		theme->get_stylebox_list(get_class_name(), &names);
@@ -481,10 +456,6 @@ bool Control::is_layout_rtl() const {
 	}
 }
 
-void Control::_resize(const Size2 &p_size) {
-	_size_changed();
-}
-
 //moved theme configuration here, so controls can set up even if still not inside active scene
 
 void Control::add_child_notify(Node *p_child) {
@@ -901,35 +872,6 @@ Ref<Texture2D> Control::get_icons(Control *p_theme_owner, Window *p_theme_owner_
 	return Theme::get_default()->get_icon(p_name, p_node_type);
 }
 
-Ref<Shader> Control::get_theme_shader(const StringName &p_name, const StringName &p_node_type) const {
-	if (p_node_type == StringName() || p_node_type == get_class_name()) {
-		const Ref<Shader> *sdr = data.shader_override.getptr(p_name);
-		if (sdr) {
-			return *sdr;
-		}
-	}
-
-	StringName type = p_node_type ? p_node_type : get_class_name();
-
-	return get_shaders(data.theme_owner, data.theme_owner_window, p_name, type);
-}
-
-Ref<Shader> Control::get_shaders(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type) {
-	Ref<Shader> shader;
-
-	if (_find_theme_item(p_theme_owner, p_theme_owner_window, shader, &Theme::get_shader, &Theme::has_shader, p_name, p_node_type)) {
-		return shader;
-	}
-
-	if (Theme::get_project_default().is_valid()) {
-		if (Theme::get_project_default()->has_shader(p_name, p_node_type)) {
-			return Theme::get_project_default()->get_shader(p_name, p_node_type);
-		}
-	}
-
-	return Theme::get_default()->get_shader(p_name, p_node_type);
-}
-
 Ref<StyleBox> Control::get_theme_stylebox(const StringName &p_name, const StringName &p_node_type) const {
 	if (p_node_type == StringName() || p_node_type == get_class_name()) {
 		const Ref<StyleBox> *style = data.style_override.getptr(p_name);
@@ -1078,11 +1020,6 @@ bool Control::has_theme_icon_override(const StringName &p_name) const {
 	return tex != nullptr;
 }
 
-bool Control::has_theme_shader_override(const StringName &p_name) const {
-	const Ref<Shader> *sdr = data.shader_override.getptr(p_name);
-	return sdr != nullptr;
-}
-
 bool Control::has_theme_stylebox_override(const StringName &p_name) const {
 	const Ref<StyleBox> *style = data.style_override.getptr(p_name);
 	return style != nullptr;
@@ -1133,31 +1070,6 @@ bool Control::has_icons(Control *p_theme_owner, Window *p_theme_owner_window, co
 	return Theme::get_default()->has_icon(p_name, p_node_type);
 }
 
-bool Control::has_theme_shader(const StringName &p_name, const StringName &p_node_type) const {
-	if (p_node_type == StringName() || p_node_type == get_class_name()) {
-		if (has_theme_shader_override(p_name)) {
-			return true;
-		}
-	}
-
-	StringName type = p_node_type ? p_node_type : get_class_name();
-
-	return has_shaders(data.theme_owner, data.theme_owner_window, p_name, type);
-}
-
-bool Control::has_shaders(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type) {
-	if (_has_theme_item(p_theme_owner, p_theme_owner_window, &Theme::has_shader, p_name, p_node_type)) {
-		return true;
-	}
-
-	if (Theme::get_project_default().is_valid()) {
-		if (Theme::get_project_default()->has_shader(p_name, p_node_type)) {
-			return true;
-		}
-	}
-	return Theme::get_default()->has_shader(p_name, p_node_type);
-}
-
 bool Control::has_theme_stylebox(const StringName &p_name, const StringName &p_node_type) const {
 	if (p_node_type == StringName() || p_node_type == get_class_name()) {
 		if (has_theme_stylebox_override(p_name)) {
@@ -1891,23 +1803,6 @@ void Control::add_theme_icon_override(const StringName &p_name, const Ref<Textur
 	notification(NOTIFICATION_THEME_CHANGED);
 }
 
-void Control::add_theme_shader_override(const StringName &p_name, const Ref<Shader> &p_shader) {
-	if (data.shader_override.has(p_name)) {
-		data.shader_override[p_name]->disconnect("changed", callable_mp(this, &Control::_override_changed));
-	}
-
-	// clear if "null" is passed instead of a shader
-	if (p_shader.is_null()) {
-		data.shader_override.erase(p_name);
-	} else {
-		data.shader_override[p_name] = p_shader;
-		if (data.shader_override[p_name].is_valid()) {
-			data.shader_override[p_name]->connect("changed", callable_mp(this, &Control::_override_changed), Vector<Variant>(), CONNECT_REFERENCE_COUNTED);
-		}
-	}
-	notification(NOTIFICATION_THEME_CHANGED);
-}
-
 void Control::add_theme_style_override(const StringName &p_name, const Ref<StyleBox> &p_style) {
 	if (data.style_override.has(p_name)) {
 		data.style_override[p_name]->disconnect("changed", callable_mp(this, &Control::_override_changed));
@@ -2905,7 +2800,6 @@ void Control::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_theme"), &Control::get_theme);
 
 	ClassDB::bind_method(D_METHOD("add_theme_icon_override", "name", "texture"), &Control::add_theme_icon_override);
-	ClassDB::bind_method(D_METHOD("add_theme_shader_override", "name", "shader"), &Control::add_theme_shader_override);
 	ClassDB::bind_method(D_METHOD("add_theme_stylebox_override", "name", "stylebox"), &Control::add_theme_style_override);
 	ClassDB::bind_method(D_METHOD("add_theme_font_override", "name", "font"), &Control::add_theme_font_override);
 	ClassDB::bind_method(D_METHOD("add_theme_font_size_override", "name", "font_size"), &Control::add_theme_font_size_override);
@@ -2920,7 +2814,6 @@ void Control::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_theme_constant", "name", "node_type"), &Control::get_theme_constant, DEFVAL(""));
 
 	ClassDB::bind_method(D_METHOD("has_theme_icon_override", "name"), &Control::has_theme_icon_override);
-	ClassDB::bind_method(D_METHOD("has_theme_shader_override", "name"), &Control::has_theme_shader_override);
 	ClassDB::bind_method(D_METHOD("has_theme_stylebox_override", "name"), &Control::has_theme_stylebox_override);
 	ClassDB::bind_method(D_METHOD("has_theme_font_override", "name"), &Control::has_theme_font_override);
 	ClassDB::bind_method(D_METHOD("has_theme_font_size_override", "name"), &Control::has_theme_font_size_override);
diff --git a/scene/gui/control.h b/scene/gui/control.h
index e1f05dfe64..8496729f05 100644
--- a/scene/gui/control.h
+++ b/scene/gui/control.h
@@ -212,7 +212,6 @@ private:
 		NodePath focus_prev;
 
 		HashMap<StringName, Ref<Texture2D>> icon_override;
-		HashMap<StringName, Ref<Shader>> shader_override;
 		HashMap<StringName, Ref<StyleBox>> style_override;
 		HashMap<StringName, Ref<Font>> font_override;
 		HashMap<StringName, int> font_size_override;
@@ -238,7 +237,6 @@ private:
 	void _update_minimum_size();
 
 	void _update_scroll();
-	void _resize(const Size2 &p_size);
 
 	void _compute_margins(Rect2 p_rect, const float p_anchors[4], float (&r_margins)[4]);
 	void _compute_anchors(Rect2 p_rect, const float p_margins[4], float (&r_anchors)[4]);
@@ -264,7 +262,6 @@ private:
 	_FORCE_INLINE_ static bool _has_theme_item(Control *p_theme_owner, Window *p_theme_owner_window, bool (Theme::*has_func)(const StringName &, const StringName &) const, const StringName &p_name, const StringName &p_node_type);
 
 	static Ref<Texture2D> get_icons(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
-	static Ref<Shader> get_shaders(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
 	static Ref<StyleBox> get_styleboxs(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
 	static Ref<Font> get_fonts(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
 	static int get_font_sizes(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
@@ -272,7 +269,6 @@ private:
 	static int get_constants(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
 
 	static bool has_icons(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
-	static bool has_shaders(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
 	static bool has_styleboxs(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
 	static bool has_fonts(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
 	static bool has_font_sizes(Control *p_theme_owner, Window *p_theme_owner_window, const StringName &p_name, const StringName &p_node_type = StringName());
@@ -456,7 +452,6 @@ public:
 	/* SKINNING */
 
 	void add_theme_icon_override(const StringName &p_name, const Ref<Texture2D> &p_icon);
-	void add_theme_shader_override(const StringName &p_name, const Ref<Shader> &p_shader);
 	void add_theme_style_override(const StringName &p_name, const Ref<StyleBox> &p_style);
 	void add_theme_font_override(const StringName &p_name, const Ref<Font> &p_font);
 	void add_theme_font_size_override(const StringName &p_name, int p_font_size);
@@ -464,7 +459,6 @@ public:
 	void add_theme_constant_override(const StringName &p_name, int p_constant);
 
 	Ref<Texture2D> get_theme_icon(const StringName &p_name, const StringName &p_node_type = StringName()) const;
-	Ref<Shader> get_theme_shader(const StringName &p_name, const StringName &p_node_type = StringName()) const;
 	Ref<StyleBox> get_theme_stylebox(const StringName &p_name, const StringName &p_node_type = StringName()) const;
 	Ref<Font> get_theme_font(const StringName &p_name, const StringName &p_node_type = StringName()) const;
 	int get_theme_font_size(const StringName &p_name, const StringName &p_node_type = StringName()) const;
@@ -472,7 +466,6 @@ public:
 	int get_theme_constant(const StringName &p_name, const StringName &p_node_type = StringName()) const;
 
 	bool has_theme_icon_override(const StringName &p_name) const;
-	bool has_theme_shader_override(const StringName &p_name) const;
 	bool has_theme_stylebox_override(const StringName &p_name) const;
 	bool has_theme_font_override(const StringName &p_name) const;
 	bool has_theme_font_size_override(const StringName &p_name) const;
@@ -480,7 +473,6 @@ public:
 	bool has_theme_constant_override(const StringName &p_name) const;
 
 	bool has_theme_icon(const StringName &p_name, const StringName &p_node_type = StringName()) const;
-	bool has_theme_shader(const StringName &p_name, const StringName &p_node_type = StringName()) const;
 	bool has_theme_stylebox(const StringName &p_name, const StringName &p_node_type = StringName()) const;
 	bool has_theme_font(const StringName &p_name, const StringName &p_node_type = StringName()) const;
 	bool has_theme_font_size(const StringName &p_name, const StringName &p_node_type = StringName()) const;
diff --git a/scene/gui/rich_text_label.cpp b/scene/gui/rich_text_label.cpp
index 08214b958e..e3b645591c 100644
--- a/scene/gui/rich_text_label.cpp
+++ b/scene/gui/rich_text_label.cpp
@@ -1424,20 +1424,6 @@ bool RichTextLabel::_find_strikethrough(Item *p_item) {
 	return false;
 }
 
-bool RichTextLabel::_find_by_type(Item *p_item, ItemType p_type) {
-	ERR_FAIL_INDEX_V((int)p_type, 19, false);
-
-	Item *item = p_item;
-
-	while (item) {
-		if (item->type == p_type) {
-			return true;
-		}
-		item = item->parent;
-	}
-	return false;
-}
-
 void RichTextLabel::_fetch_item_fx_stack(Item *p_item, Vector<ItemFX *> &r_stack) {
 	Item *item = p_item;
 	while (item) {
diff --git a/scene/gui/rich_text_label.h b/scene/gui/rich_text_label.h
index 67a3f466a6..2c74eb741d 100644
--- a/scene/gui/rich_text_label.h
+++ b/scene/gui/rich_text_label.h
@@ -375,7 +375,6 @@ private:
 	bool _find_strikethrough(Item *p_item);
 	bool _find_meta(Item *p_item, Variant *r_meta, ItemMeta **r_item = nullptr);
 	bool _find_layout_subitem(Item *from, Item *to);
-	bool _find_by_type(Item *p_item, ItemType p_type);
 	void _fetch_item_fx_stack(Item *p_item, Vector<ItemFX *> &r_stack);
 
 	static Color _get_color_from_string(const String &p_color_str, const Color &p_default_color);
diff --git a/scene/gui/scroll_bar.cpp b/scene/gui/scroll_bar.cpp
index 9340d98ede..70de63fd40 100644
--- a/scene/gui/scroll_bar.cpp
+++ b/scene/gui/scroll_bar.cpp
@@ -449,18 +449,6 @@ double ScrollBar::get_area_offset() const {
 	return ofs;
 }
 
-double ScrollBar::get_click_pos(const Point2 &p_pos) const {
-	float pos = (orientation == VERTICAL) ? p_pos.y : p_pos.x;
-	pos -= get_area_offset();
-
-	float area = get_area_size();
-	if (area == 0) {
-		return 0;
-	} else {
-		return pos / area;
-	}
-}
-
 double ScrollBar::get_grabber_offset() const {
 	return (get_area_size()) * get_as_ratio();
 }
diff --git a/scene/gui/scroll_bar.h b/scene/gui/scroll_bar.h
index 75f5ad1647..358ed74965 100644
--- a/scene/gui/scroll_bar.h
+++ b/scene/gui/scroll_bar.h
@@ -61,7 +61,6 @@ class ScrollBar : public Range {
 	double get_grabber_min_size() const;
 	double get_area_size() const;
 	double get_area_offset() const;
-	double get_click_pos(const Point2 &p_pos) const;
 	double get_grabber_offset() const;
 
 	static void set_can_focus_by_default(bool p_can_focus);
diff --git a/scene/gui/tree.cpp b/scene/gui/tree.cpp
index 6bd8003ef0..063a5e7ac1 100644
--- a/scene/gui/tree.cpp
+++ b/scene/gui/tree.cpp
@@ -597,12 +597,6 @@ String TreeItem::get_button_tooltip(int p_column, int p_idx) const {
 	return cells[p_column].buttons[p_idx].tooltip;
 }
 
-int TreeItem::get_button_id(int p_column, int p_idx) const {
-	ERR_FAIL_INDEX_V(p_column, cells.size(), -1);
-	ERR_FAIL_INDEX_V(p_idx, cells[p_column].buttons.size(), -1);
-	return cells[p_column].buttons[p_idx].id;
-}
-
 void TreeItem::erase_button(int p_column, int p_idx) {
 	ERR_FAIL_INDEX(p_column, cells.size());
 	ERR_FAIL_INDEX(p_idx, cells[p_column].buttons.size());
@@ -4081,10 +4075,6 @@ void Tree::set_cursor_can_exit_tree(bool p_enable) {
 	cursor_can_exit_tree = p_enable;
 }
 
-bool Tree::can_cursor_exit_tree() const {
-	return cursor_can_exit_tree;
-}
-
 void Tree::set_hide_folding(bool p_hide) {
 	hide_folding = p_hide;
 	update();
diff --git a/scene/gui/tree.h b/scene/gui/tree.h
index 4c3d03c91a..82422b8be3 100644
--- a/scene/gui/tree.h
+++ b/scene/gui/tree.h
@@ -227,7 +227,6 @@ public:
 	int get_button_count(int p_column) const;
 	String get_button_tooltip(int p_column, int p_idx) const;
 	Ref<Texture2D> get_button(int p_column, int p_idx) const;
-	int get_button_id(int p_column, int p_idx) const;
 	void erase_button(int p_column, int p_idx);
 	int get_button_by_id(int p_column, int p_id) const;
 	void set_button(int p_column, int p_idx, const Ref<Texture2D> &p_button);
@@ -633,7 +632,6 @@ public:
 	void scroll_to_item(TreeItem *p_item);
 
 	void set_cursor_can_exit_tree(bool p_enable);
-	bool can_cursor_exit_tree() const;
 
 	VScrollBar *get_vscroll_bar() { return v_scroll; }
 
diff --git a/scene/main/window.cpp b/scene/main/window.cpp
index d88c8fb3af..ad87139332 100644
--- a/scene/main/window.cpp
+++ b/scene/main/window.cpp
@@ -1167,11 +1167,6 @@ Ref<Texture2D> Window::get_theme_icon(const StringName &p_name, const StringName
 	return Control::get_icons(theme_owner, theme_owner_window, p_name, type);
 }
 
-Ref<Shader> Window::get_theme_shader(const StringName &p_name, const StringName &p_type) const {
-	StringName type = p_type ? p_type : get_class_name();
-	return Control::get_shaders(theme_owner, theme_owner_window, p_name, type);
-}
-
 Ref<StyleBox> Window::get_theme_stylebox(const StringName &p_name, const StringName &p_type) const {
 	StringName type = p_type ? p_type : get_class_name();
 	return Control::get_styleboxs(theme_owner, theme_owner_window, p_name, type);
@@ -1202,11 +1197,6 @@ bool Window::has_theme_icon(const StringName &p_name, const StringName &p_type)
 	return Control::has_icons(theme_owner, theme_owner_window, p_name, type);
 }
 
-bool Window::has_theme_shader(const StringName &p_name, const StringName &p_type) const {
-	StringName type = p_type ? p_type : get_class_name();
-	return Control::has_shaders(theme_owner, theme_owner_window, p_name, type);
-}
-
 bool Window::has_theme_stylebox(const StringName &p_name, const StringName &p_type) const {
 	StringName type = p_type ? p_type : get_class_name();
 	return Control::has_styleboxs(theme_owner, theme_owner_window, p_name, type);
diff --git a/scene/main/window.h b/scene/main/window.h
index a9a17ab9ba..20f8309952 100644
--- a/scene/main/window.h
+++ b/scene/main/window.h
@@ -253,7 +253,6 @@ public:
 	Rect2i get_usable_parent_rect() const;
 
 	Ref<Texture2D> get_theme_icon(const StringName &p_name, const StringName &p_type = StringName()) const;
-	Ref<Shader> get_theme_shader(const StringName &p_name, const StringName &p_type = StringName()) const;
 	Ref<StyleBox> get_theme_stylebox(const StringName &p_name, const StringName &p_type = StringName()) const;
 	Ref<Font> get_theme_font(const StringName &p_name, const StringName &p_type = StringName()) const;
 	int get_theme_font_size(const StringName &p_name, const StringName &p_type = StringName()) const;
@@ -261,7 +260,6 @@ public:
 	int get_theme_constant(const StringName &p_name, const StringName &p_type = StringName()) const;
 
 	bool has_theme_icon(const StringName &p_name, const StringName &p_type = StringName()) const;
-	bool has_theme_shader(const StringName &p_name, const StringName &p_type = StringName()) const;
 	bool has_theme_stylebox(const StringName &p_name, const StringName &p_type = StringName()) const;
 	bool has_theme_font(const StringName &p_name, const StringName &p_type = StringName()) const;
 	bool has_theme_font_size(const StringName &p_name, const StringName &p_type = StringName()) const;
diff --git a/scene/resources/packed_scene.cpp b/scene/resources/packed_scene.cpp
index 5ce253f970..09674f3465 100644
--- a/scene/resources/packed_scene.cpp
+++ b/scene/resources/packed_scene.cpp
@@ -1481,16 +1481,6 @@ int SceneState::add_name(const StringName &p_name) {
 	return names.size() - 1;
 }
 
-int SceneState::find_name(const StringName &p_name) const {
-	for (int i = 0; i < names.size(); i++) {
-		if (names[i] == p_name) {
-			return i;
-		}
-	}
-
-	return -1;
-}
-
 int SceneState::add_value(const Variant &p_value) {
 	variants.push_back(p_value);
 	return variants.size() - 1;
diff --git a/scene/resources/packed_scene.h b/scene/resources/packed_scene.h
index b8b3f84ecc..fce3891507 100644
--- a/scene/resources/packed_scene.h
+++ b/scene/resources/packed_scene.h
@@ -172,7 +172,6 @@ public:
 	//build API
 
 	int add_name(const StringName &p_name);
-	int find_name(const StringName &p_name) const;
 	int add_value(const Variant &p_value);
 	int add_node_path(const NodePath &p_path);
 	int add_node(int p_parent, int p_owner, int p_type, int p_name, int p_instance, int p_index);
diff --git a/scene/resources/style_box.cpp b/scene/resources/style_box.cpp
index a8bf44c5c0..14197c6c68 100644
--- a/scene/resources/style_box.cpp
+++ b/scene/resources/style_box.cpp
@@ -404,16 +404,6 @@ void StyleBoxFlat::set_corner_radius_individual(const int radius_top_left, const
 	emit_changed();
 }
 
-int StyleBoxFlat::get_corner_radius_min() const {
-	int smallest = corner_radius[0];
-	for (int i = 1; i < 4; i++) {
-		if (smallest > corner_radius[i]) {
-			smallest = corner_radius[i];
-		}
-	}
-	return smallest;
-}
-
 void StyleBoxFlat::set_corner_radius(const Corner p_corner, const int radius) {
 	ERR_FAIL_INDEX((int)p_corner, 4);
 	corner_radius[p_corner] = radius;
diff --git a/scene/resources/style_box.h b/scene/resources/style_box.h
index a1237776c6..7dd806e840 100644
--- a/scene/resources/style_box.h
+++ b/scene/resources/style_box.h
@@ -184,7 +184,6 @@ public:
 	//CORNER
 	void set_corner_radius_all(int radius);
 	void set_corner_radius_individual(const int radius_top_left, const int radius_top_right, const int radius_botton_right, const int radius_bottom_left);
-	int get_corner_radius_min() const;
 
 	void set_corner_radius(Corner p_corner, const int radius);
 	int get_corner_radius(Corner p_corner) const;
diff --git a/scene/resources/theme.cpp b/scene/resources/theme.cpp
index d130470275..6a752d32e7 100644
--- a/scene/resources/theme.cpp
+++ b/scene/resources/theme.cpp
@@ -421,52 +421,6 @@ void Theme::get_icon_list(StringName p_node_type, List<StringName> *p_list) cons
 	}
 }
 
-void Theme::set_shader(const StringName &p_name, const StringName &p_node_type, const Ref<Shader> &p_shader) {
-	bool new_value = !shader_map.has(p_node_type) || !shader_map[p_node_type].has(p_name);
-
-	shader_map[p_node_type][p_name] = p_shader;
-
-	if (new_value) {
-		_change_notify();
-		emit_changed();
-	}
-}
-
-Ref<Shader> Theme::get_shader(const StringName &p_name, const StringName &p_node_type) const {
-	if (shader_map.has(p_node_type) && shader_map[p_node_type].has(p_name) && shader_map[p_node_type][p_name].is_valid()) {
-		return shader_map[p_node_type][p_name];
-	} else {
-		return nullptr;
-	}
-}
-
-bool Theme::has_shader(const StringName &p_name, const StringName &p_node_type) const {
-	return (shader_map.has(p_node_type) && shader_map[p_node_type].has(p_name) && shader_map[p_node_type][p_name].is_valid());
-}
-
-void Theme::clear_shader(const StringName &p_name, const StringName &p_node_type) {
-	ERR_FAIL_COND(!shader_map.has(p_node_type));
-	ERR_FAIL_COND(!shader_map[p_node_type].has(p_name));
-
-	shader_map[p_node_type].erase(p_name);
-	_change_notify();
-	emit_changed();
-}
-
-void Theme::get_shader_list(const StringName &p_node_type, List<StringName> *p_list) const {
-	ERR_FAIL_NULL(p_list);
-
-	if (!shader_map.has(p_node_type)) {
-		return;
-	}
-
-	const StringName *key = nullptr;
-
-	while ((key = shader_map[p_node_type].next(key))) {
-		p_list->push_back(*key);
-	}
-}
-
 void Theme::set_stylebox(const StringName &p_name, const StringName &p_node_type, const Ref<StyleBox> &p_style) {
 	//ERR_FAIL_COND(p_style.is_null());
 
@@ -782,7 +736,6 @@ void Theme::clear() {
 	icon_map.clear();
 	style_map.clear();
 	font_map.clear();
-	shader_map.clear();
 	color_map.clear();
 	constant_map.clear();
 
@@ -837,7 +790,6 @@ void Theme::copy_theme(const Ref<Theme> &p_other) {
 
 	color_map = p_other->color_map;
 	constant_map = p_other->constant_map;
-	shader_map = p_other->shader_map;
 
 	_change_notify();
 	emit_changed();
diff --git a/scene/resources/theme.h b/scene/resources/theme.h
index 4175e19112..6ac47e8931 100644
--- a/scene/resources/theme.h
+++ b/scene/resources/theme.h
@@ -34,7 +34,6 @@
 #include "core/io/resource.h"
 #include "core/io/resource_loader.h"
 #include "scene/resources/font.h"
-#include "scene/resources/shader.h"
 #include "scene/resources/style_box.h"
 #include "scene/resources/texture.h"
 
@@ -48,7 +47,6 @@ class Theme : public Resource {
 	HashMap<StringName, HashMap<StringName, Ref<StyleBox>>> style_map;
 	HashMap<StringName, HashMap<StringName, Ref<Font>>> font_map;
 	HashMap<StringName, HashMap<StringName, int>> font_size_map;
-	HashMap<StringName, HashMap<StringName, Ref<Shader>>> shader_map;
 	HashMap<StringName, HashMap<StringName, Color>> color_map;
 	HashMap<StringName, HashMap<StringName, int>> constant_map;
 
@@ -102,12 +100,6 @@ public:
 	void clear_icon(const StringName &p_name, const StringName &p_node_type);
 	void get_icon_list(StringName p_node_type, List<StringName> *p_list) const;
 
-	void set_shader(const StringName &p_name, const StringName &p_node_type, const Ref<Shader> &p_shader);
-	Ref<Shader> get_shader(const StringName &p_name, const StringName &p_node_type) const;
-	bool has_shader(const StringName &p_name, const StringName &p_node_type) const;
-	void clear_shader(const StringName &p_name, const StringName &p_node_type);
-	void get_shader_list(const StringName &p_node_type, List<StringName> *p_list) const;
-
 	void set_stylebox(const StringName &p_name, const StringName &p_node_type, const Ref<StyleBox> &p_style);
 	Ref<StyleBox> get_stylebox(const StringName &p_name, const StringName &p_node_type) const;
 	bool has_stylebox(const StringName &p_name, const StringName &p_node_type) const;
diff --git a/servers/camera_server.h b/servers/camera_server.h
index 54acce006a..e09b883eee 100644
--- a/servers/camera_server.h
+++ b/servers/camera_server.h
@@ -95,15 +95,16 @@ public:
 	int get_feed_index(int p_id);
 	Ref<CameraFeed> get_feed_by_id(int p_id);
 
-	// add and remove feeds
+	// Add and remove feeds.
 	void add_feed(const Ref<CameraFeed> &p_feed);
 	void remove_feed(const Ref<CameraFeed> &p_feed);
 
-	// get our feeds
+	// Get our feeds.
 	Ref<CameraFeed> get_feed(int p_index);
 	int get_feed_count();
 	Array get_feeds();
 
+	// Intended for use with custom CameraServer implementation.
 	RID feed_texture(int p_id, FeedImage p_texture);
 
 	CameraServer();
diff --git a/servers/rendering_server.cpp b/servers/rendering_server.cpp
index b971704ce2..b033b09303 100644
--- a/servers/rendering_server.cpp
+++ b/servers/rendering_server.cpp
@@ -2184,15 +2184,6 @@ void RenderingServer::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("frame_post_draw"));
 }
 
-void RenderingServer::_canvas_item_add_style_box(RID p_item, const Rect2 &p_rect, const Rect2 &p_source, RID p_texture, const Vector<float> &p_margins, const Color &p_modulate) {
-	ERR_FAIL_COND(p_margins.size() != 4);
-	//canvas_item_add_style_box(p_item,p_rect,p_source,p_texture,Vector2(p_margins[0],p_margins[1]),Vector2(p_margins[2],p_margins[3]),true,p_modulate);
-}
-
-void RenderingServer::_camera_set_orthogonal(RID p_camera, float p_size, float p_z_near, float p_z_far) {
-	camera_set_orthogonal(p_camera, p_size, p_z_near, p_z_far);
-}
-
 void RenderingServer::mesh_add_surface_from_mesh_data(RID p_mesh, const Geometry3D::MeshData &p_mesh_data) {
 	Vector<Vector3> vertices;
 	Vector<Vector3> normals;
diff --git a/servers/rendering_server.h b/servers/rendering_server.h
index abe3cc6975..5865cc7adf 100644
--- a/servers/rendering_server.h
+++ b/servers/rendering_server.h
@@ -50,8 +50,6 @@ class RenderingServer : public Object {
 	int mm_policy;
 	bool render_loop_enabled = true;
 
-	void _camera_set_orthogonal(RID p_camera, float p_size, float p_z_near, float p_z_far);
-	void _canvas_item_add_style_box(RID p_item, const Rect2 &p_rect, const Rect2 &p_source, RID p_texture, const Vector<float> &p_margins, const Color &p_modulate = Color(1, 1, 1));
 	Array _get_array_from_surface(uint32_t p_format, Vector<uint8_t> p_vertex_data, Vector<uint8_t> p_attrib_data, Vector<uint8_t> p_skin_data, int p_vertex_len, Vector<uint8_t> p_index_data, int p_index_len) const;
 
 protected: