Add intellisense for onOpenExternalUri activation and rename event

Fixes #115131

Also renames the activation event to `onOpenExternalUri`

extensions/simple-browser/package.json

@@ -19,8 +19,8 @@
   "activationEvents": [
     "onCommand:simpleBrowser.show",
     "onCommand:simpleBrowser.api.open",
-    "onUriOpen:http",
-    "onUriOpen:https"
+    "onOpenExternalUri:http",
+    "onOpenExternalUri:https"
   ],
   "contributes": {
     "commands": [

src/vs/vscode.proposed.d.ts

@@ -2623,7 +2623,7 @@ declare module 'vscode' {
 		/**
 		 * Register a new `ExternalUriOpener`.
 		 *
-		 * When a uri is about to be opened, an `onUriOpen:SCHEME` activation event is fired.
+		 * When a uri is about to be opened, an `onOpenExternalUri:SCHEME` activation event is fired.
 		 *
 		 * @param id Unique id of the opener, such as `myExtension.browserPreview`. This is used in settings
 		 *   and commands to identify the opener.

src/vs/workbench/api/browser/mainThreadUriOpeners.ts

@@ -56,7 +56,7 @@ export class MainThreadUriOpeners extends Disposable implements MainThreadUriOpe
 			return;
 		}
 
-		await this.extensionService.activateByEvent(`onUriOpen:${targetUri.scheme}`);
+		await this.extensionService.activateByEvent(`onOpenExternalUri:${targetUri.scheme}`);
 
 		for (const [id, openerMetadata] of this._registeredOpeners) {
 			if (openerMetadata.schemes.has(targetUri.scheme)) {

src/vs/workbench/services/extensions/common/extensionsRegistry.ts

@@ -300,6 +300,11 @@ export const schema: IJSONSchema = {
 						body: 'onUri',
 						description: nls.localize('vscode.extension.activationEvents.onUri', 'An activation event emitted whenever a system-wide Uri directed towards this extension is open.'),
 					},
+					{
+						label: 'onOpenExternalUri',
+						body: 'onOpenExternalUri',
+						description: nls.localize('vscode.extension.activationEvents.onOpenExternalUri', 'An activation event emitted whenever a external uri (such as an http or https link) is being opened.'),
+					},
 					{
 						label: 'onCustomEditor',
 						body: 'onCustomEditor:${9:viewType}',