Fix fades broken on speed change.

BUG: 409159

src/timeline2/model/clipmodel.cpp

@@ -448,6 +448,7 @@ bool ClipModel::useTimewarpProducer(double speed, Fun &undo, Fun &redo)
             local_undo();
             return false;
         }
+        adjustEffectLength(false, oldIn, getIn(), oldOut - oldIn, m_producer->get_playtime(), 0, local_undo, local_redo, true);
         UPDATE_UNDO_REDO(local_redo, local_undo, undo, redo);
         return true;
     }