cache: save states to disk

app/render/previewautocacher.cpp

@@ -345,6 +345,10 @@ void PreviewAutoCacher::ConnectToNodeCache(Node *node)
           this,
           &PreviewAutoCacher::AudioInvalidatedFromCache);
 
+  node->video_frame_cache()->LoadState();
+  node->audio_playback_cache()->LoadState();
+  node->thumbnail_cache()->LoadState();
+
   // Copy invalidated ranges and start rendering if necessary
   if (node->video_frame_cache()->IsAutomatic()) {
     VideoAutoCacheEnableChangedFromNode(node, true);
@@ -382,6 +386,10 @@ void PreviewAutoCacher::DisconnectFromNodeCache(Node *node)
              this,
              &PreviewAutoCacher::AudioInvalidatedFromCache);
 
+  node->video_frame_cache()->SaveState();
+  node->audio_playback_cache()->SaveState();
+  node->thumbnail_cache()->SaveState();
+
   if (node->video_frame_cache()->IsAutomatic()) {
     VideoAutoCacheEnableChangedFromNode(node, false);
   }
@@ -841,6 +849,9 @@ void PreviewAutoCacher::SetViewerNode(ViewerOutput *viewer_node)
     for (int i=copied_project_.nodes().size(); i<graph->nodes().size(); i++) {
       AddNode(graph->nodes().at(i));
     }
+    for (int i=0; i<graph->nodes().size(); i++) {
+      graph->nodes().at(i)->ConnectedToPreviewEvent();
+    }
 
     // Find copied viewer node
     copied_viewer_node_ = static_cast<ViewerOutput*>(copy_map_.value(viewer_node_));