fix microsoft#107847.

rebornix · rebornix · commit 264d2d28fb81 · 2020-09-30T16:16:45.000-07:00
diff --git a/src/vs/editor/browser/controller/coreCommands.ts b/src/vs/editor/browser/controller/coreCommands.ts
@@ -4,6 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as nls from 'vs/nls';
+import { isFirefox } from 'vs/base/browser/browser';
 import { KeyCode, KeyMod } from 'vs/base/common/keyCodes';
 import * as types from 'vs/base/common/types';
 import { ICodeEditor } from 'vs/editor/browser/editorBrowser';
@@ -1640,6 +1641,11 @@ export namespace CoreNavigationCommands {
 			super(SelectAllCommand);
 		}
 		public runDOMCommand(): void {
+			if (isFirefox) {
+				(<HTMLInputElement>document.activeElement).focus();
+				(<HTMLInputElement>document.activeElement).select();
+			}
+
 			document.execCommand('selectAll');
 		}
 		public runEditorCommand(accessor: ServicesAccessor, editor: ICodeEditor, args: any): void {
