src/vs/workbench/contrib/markers/browser/markersViewActions.ts/MarkersFilterActionViewItem/onInputKeyDown
class MarkersFilterActionViewItem:	private onInputKeyDown(event: StandardKeyboardEvent, filterInputBox: HistoryInputBox) {
		let handled = false;
		if (event.equals(KeyCode.Tab)) {
			this.actionbar?.focus();
			handled = true;
		}
		if (handled) {
			event.stopPropagation();
			event.preventDefault();
		}
	}