src/vs/workbench/browser/parts/panel/panelPart.ts/PanelPart/create
class PanelPart:	override create(parent: HTMLElement): void {
		this.element = parent;

		super.create(parent);

		this.createEmptyPanelMessage();

		const focusTracker = this._register(trackFocus(parent));
		this._register(focusTracker.onDidFocus(() => this.panelFocusContextKey.set(true)));
		this._register(focusTracker.onDidBlur(() => this.panelFocusContextKey.set(false)));
	}