src/vs/workbench/contrib/editSessions/browser/editSessions.contribution.ts/EditSessionsContribution/getChangedResources
class EditSessionsContribution:	private getChangedResources(repository: ISCMRepository) {
		return repository.provider.groups.elements.reduce((resources, resourceGroups) => {
			resourceGroups.elements.forEach((resource) => resources.add(resource.sourceUri));
			return resources;
		}, new Set<URI>()); // A URI might appear in more than one resource group
	}