src/vs/workbench/contrib/scm/browser/scmViewService.ts/SCMViewService/focus
class SCMViewService:	focus(repository: ISCMRepository | undefined): void {
		if (repository && !this.isVisible(repository)) {
			return;
		}

		this._repositories.forEach(r => r.focused = r.repository === repository);

		if (this._repositories.find(r => r.focused)) {
			this._onDidFocusRepository.fire(repository);
		}
	}