Thumbnail handlers reload (#12996)

.github/actions/spell-check/expect.txt

@@ -103,6 +103,7 @@ asm
 asmx
 aspnet
 aspx
+ASSOCCHANGED
 ASYNCWINDOWPLACEMENT
 ASYNCWINDOWPOS
 atl
@@ -844,6 +845,7 @@ IDirectory
 IDispatch
 IDisposable
 idl
+IDLIST
 IDOK
 IDOn
 IDR
@@ -1855,6 +1857,8 @@ sfgao
 SFGAOF
 SHAREIMAGELISTS
 sharpkeys
+SHCNE
+SHCNF
 shcore
 shellapi
 SHELLDLL

src/modules/previewpane/powerpreview/settings.cpp

@@ -3,6 +3,8 @@
 #include "trace.h"
 #include <iostream>
 #include <atlstr.h>
+#include <powerpreview/thumbnail_provider.h>
+#include <ShlObj_core.h>
 
 using namespace std;
 
@@ -98,6 +100,11 @@ namespace PowerPreviewSettings
                             {
                                 Trace::PowerPreviewSettingsUpdateFailed(this->GetToggleSettingName().c_str(), lastState, newState, enabled);
                             }
+
+                            if (dynamic_cast<ThumbnailProviderSettings*>(this))
+                            {
+                                SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, NULL, NULL);
+                            }
                         }
                         // If process is not elevated, return false as it is not possible to update the registry
                         else