src/vs/workbench/browser/parts/compositePart.ts/CompositePart/onTitleAreaUpdate
class CompositePart:	protected onTitleAreaUpdate(compositeId: string): void {

		// Title
		const composite = this.instantiatedCompositeItems.get(compositeId);
		if (composite) {
			this.updateTitle(compositeId, composite.composite.getTitle());
		}

		// Active Composite
		if (this.activeComposite?.getId() === compositeId) {
			// Actions
			const actionsBinding = this.collectCompositeActions(this.activeComposite);
			this.mapActionsBindingToComposite.set(this.activeComposite.getId(), actionsBinding);
			actionsBinding();
		}

		// Otherwise invalidate actions binding for next time when the composite becomes visible
		else {
			this.mapActionsBindingToComposite.delete(compositeId);
		}
	}