src/vs/workbench/browser/parts/views/viewPane.ts/ViewPane/render
class ViewPane:	override render(): void {
		super.render();

		const focusTracker = trackFocus(this.element);
		this._register(focusTracker);
		this._register(focusTracker.onDidFocus(() => this._onDidFocus.fire()));
		this._register(focusTracker.onDidBlur(() => this._onDidBlur.fire()));
	}