src/vs/workbench/contrib/extensions/browser/extensionsViewlet.ts/ExtensionsViewPaneContainer/alertSearchResult
class ExtensionsViewPaneContainer:	private alertSearchResult(count: number, viewId: string): void {
		const view = this.viewContainerModel.visibleViewDescriptors.find(view => view.id === viewId);
		switch (count) {
			case 0:
				break;
			case 1:
				if (view) {
					alert(localize('extensionFoundInSection', "1 extension found in the {0} section.", view.name));
				} else {
					alert(localize('extensionFound', "1 extension found."));
				}
				break;
			default:
				if (view) {
					alert(localize('extensionsFoundInSection', "{0} extensions found in the {1} section.", count, view.name));
				} else {
					alert(localize('extensionsFound', "{0} extensions found.", count));
				}
				break;
		}
	}