Properly search for extensions

libdiscover/backends/PackageKitBackend/PackageKitBackend.cpp

@@ -373,6 +373,9 @@ ResultsStream* PackageKitBackend::search(const AbstractResourcesBackend::Filters
 {
     if (!filter.resourceUrl.isEmpty()) {
         return findResourceByPackageName(filter.resourceUrl);
+    } else if (!filter.extends.isEmpty()) {
+        const auto ext = kTransform<QVector<AbstractResource*>>(m_packages.extendedBy[filter.extends], [](AppPackageKitResource* a){ return a; });
+        return new ResultsStream(QStringLiteral("PackageKitStream-extends"), ext);
     } else if (filter.search.isEmpty()) {
         return new ResultsStream(QStringLiteral("PackageKitStream-all"), kFilter<QVector<AbstractResource*>>(m_packages.packages, [](AbstractResource* res) { return !res->isTechnical(); }));
     } else {