timelineview: update rect on height change

Fixes #1950

app/node/output/track/tracklist.cpp

@@ -81,6 +81,9 @@ void TrackList::TrackConnected(Node *node, int element)
   UpdateTrackIndexesFrom(cache_index);
 
   connect(track, &Track::TrackLengthChanged, this, &TrackList::UpdateTotalLength);
+  connect(track, &Track::TrackHeightChangedInPixels, this, [this](int height){
+    emit TrackHeightChanged(static_cast<Track*>(sender()), height);
+  });
 
   track->set_type(type_);
   track->set_sequence(parent());

app/node/output/track/tracklist.h

@@ -101,6 +101,8 @@ signals:
 
   void TrackRemoved(Track* track);
 
+  void TrackHeightChanged(Track *track, int height);
+
 private:
   void UpdateTrackIndexesFrom(int index);