timeline: add rename action

This used to be possible in properties, but then the properties action changed. Oops.

app/widget/timelinewidget/timelinewidget.cpp

@@ -1079,6 +1079,9 @@ void TimelineWidget::ShowContextMenu()
       }
     }
 
+    QAction* rename_action = menu.addAction(tr("Rename"));
+    connect(rename_action, &QAction::triggered, this, &TimelineWidget::RenameSelectedBlocks);
+
     QAction* properties_action = menu.addAction(tr("Properties"));
     connect(properties_action, &QAction::triggered, this, &TimelineWidget::ShowSpeedDurationDialogForSelectedClips);
   }
@@ -1232,6 +1235,19 @@ void TimelineWidget::RevealInProject()
   emit RevealViewerInProject(item_to_reveal);
 }
 
+void TimelineWidget::RenameSelectedBlocks()
+{
+  MultiUndoCommand *command = new MultiUndoCommand();
+  QVector<Node*> nodes(selected_blocks_.size());
+
+  for (int i=0; i<nodes.size(); i++) {
+    nodes[i] = selected_blocks_[i];
+  }
+
+  Core::instance()->LabelNodes(nodes);
+  Core::instance()->undo_stack()->pushIfHasChildren(command);
+}
+
 void TimelineWidget::AddGhost(TimelineViewGhostItem *ghost)
 {
   ghost_items_.append(ghost);

app/widget/timelinewidget/timelinewidget.h

@@ -414,6 +414,8 @@ private slots:
 
   void RevealInProject();
 
+  void RenameSelectedBlocks();
+
 };
 
 }