src/vs/workbench/browser/parts/compositePart.ts/CompositePart/updateTitle
class CompositePart:	private updateTitle(compositeId: string, compositeTitle?: string): void {
		const compositeDescriptor = this.registry.getComposite(compositeId);
		if (!compositeDescriptor || !this.titleLabel) {
			return;
		}

		if (!compositeTitle) {
			compositeTitle = compositeDescriptor.name;
		}

		const keybinding = this.keybindingService.lookupKeybinding(compositeId);

		this.titleLabel.updateTitle(compositeId, compositeTitle, withNullAsUndefined(keybinding?.getLabel()));

		const toolBar = assertIsDefined(this.toolBar);
		toolBar.setAriaLabel(localize('ariaCompositeToolbarLabel', "{0} actions", compositeTitle));
	}