Fixes #41357

src/vs/editor/contrib/toggleTabFocusMode/toggleTabFocusMode.ts

@@ -10,6 +10,7 @@ import { registerEditorAction, ServicesAccessor, EditorAction } from 'vs/editor/
 import { TabFocus } from 'vs/editor/common/config/commonEditorConfig';
 import { ICodeEditor } from 'vs/editor/browser/editorBrowser';
 import { KeybindingWeight } from 'vs/platform/keybinding/common/keybindingsRegistry';
+import { alert } from 'vs/base/browser/ui/aria/aria';
 
 export class ToggleTabFocusModeAction extends EditorAction {
 
@@ -31,8 +32,14 @@ export class ToggleTabFocusModeAction extends EditorAction {
 	}
 
 	public run(accessor: ServicesAccessor, editor: ICodeEditor): void {
-		let oldValue = TabFocus.getTabFocusMode();
-		TabFocus.setTabFocusMode(!oldValue);
+		const oldValue = TabFocus.getTabFocusMode();
+		const newValue = !oldValue;
+		TabFocus.setTabFocusMode(newValue);
+		if (newValue) {
+			alert(nls.localize('toggle.tabMovesFocus.on', "Pressing Tab will now move focus to the next focusable element"));
+		} else {
+			alert(nls.localize('toggle.tabMovesFocus.off', "Pressing Tab will now insert the tab character"));
+		}
 	}
 }