Enable select all in iframe based webviews

src/vs/workbench/contrib/webview/browser/baseWebviewElement.ts

@@ -286,4 +286,10 @@ export abstract class BaseWebview<T extends HTMLElement> extends Disposable {
 			this.element.style.pointerEvents = '';
 		}
 	}
+
+	public selectAll() {
+		if (this.element) {
+			this._send('execCommand', 'selectAll');
+		}
+	}
 }

src/vs/workbench/contrib/webview/browser/dynamicWebviewEditorOverlay.ts

@@ -187,6 +187,7 @@ export class DynamicWebviewEditorOverlay extends Disposable implements WebviewEd
 	showFind(): void { this.withWebview(webview => webview.showFind()); }
 	hideFind(): void { this.withWebview(webview => webview.hideFind()); }
 	runFindAction(previous: boolean): void { this.withWebview(webview => webview.runFindAction(previous)); }
+	selectAll(): void { this.withWebview(webview => webview.selectAll()); }
 
 	public getInnerWebview() {
 		return this._webview.value;

src/vs/workbench/contrib/webview/browser/pre/main.js

@@ -545,6 +545,13 @@
 				initData.initialScrollProgress = progress;
 			});
 
+			host.onMessage('execCommand', (_event, data) => {
+				const target = getActiveFrame();
+				if (!target) {
+					return;
+				}
+				target.contentDocument.execCommand(data);
+			});
 
 			trackFocus({
 				onFocus: () => host.postMessage('did-focus'),

src/vs/workbench/contrib/webview/browser/webview.contribution.ts

@@ -14,7 +14,7 @@ import { Extensions as ActionExtensions, IWorkbenchActionRegistry } from 'vs/wor
 import { Extensions as EditorInputExtensions, IEditorInputFactoryRegistry } from 'vs/workbench/common/editor';
 import { webviewDeveloperCategory } from 'vs/workbench/contrib/webview/browser/webview';
 import { WebviewEditorInputFactory } from 'vs/workbench/contrib/webview/browser/webviewEditorInputFactory';
-import { HideWebViewEditorFindCommand, ReloadWebviewAction, ShowWebViewEditorFindWidgetAction, WebViewEditorFindNextCommand, WebViewEditorFindPreviousCommand } from '../browser/webviewCommands';
+import { HideWebViewEditorFindCommand, ReloadWebviewAction, ShowWebViewEditorFindWidgetAction, WebViewEditorFindNextCommand, WebViewEditorFindPreviousCommand, SelectAllWebviewEditorCommand } from '../browser/webviewCommands';
 import { WebviewEditor } from './webviewEditor';
 import { WebviewInput } from './webviewEditorInput';
 import { IWebviewWorkbenchService, WebviewEditorService } from './webviewWorkbenchService';
@@ -50,6 +50,11 @@ registerAction2(class extends WebViewEditorFindPreviousCommand {
 	constructor() { super(webviewActiveContextKeyExpr); }
 });
 
+registerAction2(class extends SelectAllWebviewEditorCommand {
+	constructor() { super(webviewActiveContextKeyExpr); }
+});
+
+
 const actionRegistry = Registry.as<IWorkbenchActionRegistry>(ActionExtensions.WorkbenchActions);
 actionRegistry.registerWorkbenchAction(
 	SyncActionDescriptor.create(ReloadWebviewAction, ReloadWebviewAction.ID, ReloadWebviewAction.LABEL),

src/vs/workbench/contrib/webview/browser/webview.ts

@@ -93,6 +93,8 @@ export interface Webview extends IDisposable {
 	hideFind(): void;
 	runFindAction(previous: boolean): void;
 
+	selectAll(): void;
+
 	windowDidDragStart(): void;
 	windowDidDragEnd(): void;
 }

src/vs/workbench/contrib/webview/browser/webviewCommands.ts

@@ -13,6 +13,7 @@ import { KeybindingWeight } from 'vs/platform/keybinding/common/keybindingsRegis
 import { KEYBINDING_CONTEXT_WEBVIEW_FIND_WIDGET_FOCUSED, KEYBINDING_CONTEXT_WEBVIEW_FIND_WIDGET_VISIBLE } from 'vs/workbench/contrib/webview/browser/webview';
 import { WebviewEditor } from 'vs/workbench/contrib/webview/browser/webviewEditor';
 import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
+import { InputFocusedContextKey } from 'vs/platform/contextkey/common/contextkeys';
 
 export class ShowWebViewEditorFindWidgetAction extends Action2 {
 	public static readonly ID = 'editor.action.webvieweditor.showFind';
@@ -97,6 +98,29 @@ export class WebViewEditorFindPreviousCommand extends Action2 {
 		getActiveWebviewEditor(accessor)?.find(true);
 	}
 }
+
+export class SelectAllWebviewEditorCommand extends Action2 {
+	public static readonly ID = 'editor.action.webvieweditor.selectAll';
+	public static readonly LABEL = nls.localize('editor.action.webvieweditor.selectAll', 'Select all');
+
+	constructor(contextKeyExpr: ContextKeyExpr) {
+		const precondition = ContextKeyExpr.and(contextKeyExpr, ContextKeyExpr.not(InputFocusedContextKey));
+		super({
+			id: SelectAllWebviewEditorCommand.ID,
+			title: SelectAllWebviewEditorCommand.LABEL,
+			keybinding: {
+				when: precondition,
+				primary: KeyMod.CtrlCmd | KeyCode.KEY_A,
+				weight: KeybindingWeight.EditorContrib
+			}
+		});
+	}
+
+	public run(accessor: ServicesAccessor, args: any): void {
+		getActiveWebviewEditor(accessor)?.selectAll();
+	}
+}
+
 export class ReloadWebviewAction extends Action {
 	static readonly ID = 'workbench.action.webview.reloadWebviewAction';
 	static readonly LABEL = nls.localize('refreshWebviewLabel', "Reload Webviews");

src/vs/workbench/contrib/webview/browser/webviewEditor.ts

@@ -88,6 +88,12 @@ export class WebviewEditor extends BaseEditor {
 		});
 	}
 
+	public selectAll() {
+		this.withWebview(webview => {
+			webview.selectAll();
+		});
+	}
+
 	public reload() {
 		this.withWebview(webview => webview.reload());
 	}

src/vs/workbench/contrib/webview/electron-browser/webview.contribution.ts

@@ -26,8 +26,6 @@ actionRegistry.registerWorkbenchAction(
 function registerWebViewCommands(editorId: string): void {
 	const contextKeyExpr = ContextKeyExpr.and(ContextKeyExpr.equals('activeEditor', editorId), ContextKeyExpr.not('editorFocus') /* https://github.com/Microsoft/vscode/issues/58668 */)!;
 
-	registerAction2(class extends webviewCommands.SelectAllWebviewEditorCommand { constructor() { super(contextKeyExpr); } });
-
 	// These commands are only needed on MacOS where we have to disable the menu bar commands
 	if (isMacintosh) {
 		registerAction2(class extends webviewCommands.CopyWebviewEditorCommand { constructor() { super(contextKeyExpr); } });

src/vs/workbench/contrib/webview/electron-browser/webviewCommands.ts

@@ -38,28 +38,6 @@ export class OpenWebviewDeveloperToolsAction extends Action {
 	}
 }
 
-export class SelectAllWebviewEditorCommand extends Action2 {
-	public static readonly ID = 'editor.action.webvieweditor.selectAll';
-	public static readonly LABEL = nls.localize('editor.action.webvieweditor.selectAll', 'Select all');
-
-	constructor(contextKeyExpr: ContextKeyExpr) {
-		const precondition = ContextKeyExpr.and(contextKeyExpr, ContextKeyExpr.not(InputFocusedContextKey));
-		super({
-			id: SelectAllWebviewEditorCommand.ID,
-			title: SelectAllWebviewEditorCommand.LABEL,
-			keybinding: {
-				when: precondition,
-				primary: KeyMod.CtrlCmd | KeyCode.KEY_A,
-				weight: KeybindingWeight.EditorContrib
-			}
-		});
-	}
-
-	public run(accessor: ServicesAccessor, args: any): void {
-		withActiveWebviewBasedWebview(accessor, webview => webview.selectAll());
-	}
-}
-
 export class CopyWebviewEditorCommand extends Action2 {
 	public static readonly ID = 'editor.action.webvieweditor.copy';
 	public static readonly LABEL = nls.localize('editor.action.webvieweditor.copy', "Copy2");