src/vs/editor/contrib/toggleTabFocusMode/browser/toggleTabFocusMode.ts/ToggleTabFocusModeAction/run
class ToggleTabFocusModeAction:	public run(accessor: ServicesAccessor, editor: ICodeEditor): void {
		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"));
		}
	}