flatpak: Use the sources map to check if a resource is already being used

We are not using the fetching property anymore and we were emitting some
signals unnecessarily.


(cherry picked from commit 32fd68ca)

libdiscover/backends/FlatpakBackend/FlatpakBackend.cpp

@@ -1441,6 +1441,17 @@ ResultsStream *FlatpakBackend::search(const AbstractResourcesBackend::Filters &f
     return stream;
 }
 
+bool FlatpakBackend::isTracked(FlatpakResource *resource) const
+{
+    const auto uid = resource->uniqueId();
+    for (const auto &source : m_flatpakSources) {
+        if (source->m_resources.contains(uid)) {
+            return true;
+        }
+    }
+    return false;
+}
+
 QVector<AbstractResource *> FlatpakBackend::resourcesByAppstreamName(const QString &name) const
 {
     QVector<AbstractResource *> resources;

libdiscover/backends/FlatpakBackend/FlatpakBackend.h

@@ -82,6 +82,8 @@ public:
         return m_installations;
     }
 
+    bool isTracked(FlatpakResource *resource) const;
+
 private Q_SLOTS:
     void onFetchMetadataFinished(FlatpakResource *resource, const QByteArray &metadata);
     void onFetchSizeFinished(FlatpakResource *resource, guint64 downloadSize, guint64 installedSize);

libdiscover/backends/FlatpakBackend/FlatpakResource.cpp

@@ -542,8 +542,9 @@ void FlatpakResource::setState(AbstractResource::State state)
     if (m_state != state) {
         m_state = state;
 
-        if (!backend()->isFetching())
+        if (qobject_cast<FlatpakBackend *>(backend())->isTracked(this)) {
             Q_EMIT stateChanged();
+        }
     }
 }