src/vs/base/browser/ui/list/listWidget.ts/MouseController/onMouseDown
class MouseController:	private onMouseDown(e: IListMouseEvent<T> | IListTouchEvent<T>): void {
		if (isMonacoEditor(e.browserEvent.target as HTMLElement)) {
			return;
		}

		if (document.activeElement !== e.browserEvent.target) {
			this.list.domFocus();
		}
	}