src/vs/workbench/contrib/tags/electron-sandbox/workspaceTagsService.ts/WorkspaceTagsService/findFolder
class WorkspaceTagsService:	private findFolder(): URI | undefined {
		const { filesToOpenOrCreate, filesToDiff } = this.environmentService.configuration;
		if (filesToOpenOrCreate && filesToOpenOrCreate.length) {
			return this.parentURI(filesToOpenOrCreate[0].fileUri);
		} else if (filesToDiff && filesToDiff.length) {
			return this.parentURI(filesToDiff[0].fileUri);
		}
		return undefined;
	}