src/vs/workbench/contrib/extensions/browser/configBasedRecommendations.ts/ConfigBasedRecommendations/onWorkspaceFoldersChanged
class ConfigBasedRecommendations:	private async onWorkspaceFoldersChanged(event: IWorkspaceFoldersChangeEvent): Promise<void> {
		if (event.added.length) {
			const oldImportantRecommended = this.importantTips;
			await this.fetch();
			// Suggest only if at least one of the newly added recommendations was not suggested before
			if (this.importantTips.some(current => oldImportantRecommended.every(old => current.extensionId !== old.extensionId))) {
				this._onDidChangeRecommendations.fire();
			}
		}
	}