src/vs/workbench/browser/parts/compositePart.ts/CompositePart/openComposite
class CompositePart:	protected openComposite(id: string, focus?: boolean): Composite | undefined {

		// Check if composite already visible and just focus in that case
		if (this.activeComposite?.getId() === id) {
			if (focus) {
				this.activeComposite.focus();
			}

			// Fullfill promise with composite that is being opened
			return this.activeComposite;
		}

		// We cannot open the composite if we have not been created yet
		if (!this.element) {
			return;
		}

		// Open
		return this.doOpenComposite(id, focus);
	}