src/vs/workbench/contrib/preferences/browser/preferencesWidgets.ts/FolderSettingsActionViewItem/setCount
class FolderSettingsActionViewItem:	setCount(settingsTarget: URI, count: number): void {
		const workspaceFolder = this.contextService.getWorkspaceFolder(settingsTarget);
		if (!workspaceFolder) {
			throw new Error('unknown folder');
		}
		const folder = workspaceFolder.uri;
		this._folderSettingCounts.set(folder.toString(), count);
		this.update();
	}