src/vs/workbench/services/views/browser/viewDescriptorService.ts/ViewDescriptorService/regroupViews
class ViewDescriptorService:	private regroupViews(containerId: string, views: IViewDescriptor[]): Map<string, IViewDescriptor[]> {
		const viewsByContainer = new Map<string, IViewDescriptor[]>();

		for (const viewDescriptor of views) {
			const correctContainerId = this.viewDescriptorsCustomLocations.get(viewDescriptor.id) ?? containerId;
			let containerViews = viewsByContainer.get(correctContainerId);
			if (!containerViews) {
				viewsByContainer.set(correctContainerId, containerViews = []);
			}
			containerViews.push(viewDescriptor);
		}

		return viewsByContainer;
	}