timeline: removed unused variable in undo command

app/widget/timelinewidget/tool/ripple.cpp

@@ -53,11 +53,10 @@ void TimelineWidget::RippleTool::MouseReleaseInternal(TimelineViewMouseEvent *ev
 
         Block* block_to_append_gap_to = Node::ValueToPtr<Block>(ghost->data(TimelineViewGhostItem::kReferenceBlock));
 
-        new TrackInsertBlockBetweenBlocksCommand(parent()->GetTrackFromReference(ghost->Track()),
-                                                 gap,
-                                                 block_to_append_gap_to,
-                                                 block_to_append_gap_to->next(),
-                                                 command);
+        new TrackInsertBlockAfterCommand(parent()->GetTrackFromReference(ghost->Track()),
+                                         gap,
+                                         block_to_append_gap_to,
+                                         command);
       }
     } else {
       // This was a Block that already existed

app/widget/timelinewidget/undo/undo.cpp

@@ -106,25 +106,23 @@ void TrackRippleRemoveBlockCommand::undo()
   }
 }
 
-TrackInsertBlockBetweenBlocksCommand::TrackInsertBlockBetweenBlocksCommand(TrackOutput *track,
+TrackInsertBlockAfterCommand::TrackInsertBlockAfterCommand(TrackOutput *track,
                                                                            Block *block,
                                                                            Block *before,
-                                                                           Block *after,
                                                                            QUndoCommand *parent) :
   QUndoCommand(parent),
   track_(track),
   block_(block),
-  before_(before),
-  after_(after)
+  before_(before)
 {
 }
 
-void TrackInsertBlockBetweenBlocksCommand::redo()
+void TrackInsertBlockAfterCommand::redo()
 {
   track_->InsertBlockAfter(block_, before_);
 }
 
-void TrackInsertBlockBetweenBlocksCommand::undo()
+void TrackInsertBlockAfterCommand::undo()
 {
   track_->RippleRemoveBlock(block_);
 }

app/widget/timelinewidget/undo/undo.h

@@ -108,9 +108,9 @@ private:
   Block* block_;
 };
 
-class TrackInsertBlockBetweenBlocksCommand : public QUndoCommand {
+class TrackInsertBlockAfterCommand : public QUndoCommand {
 public:
-  TrackInsertBlockBetweenBlocksCommand(TrackOutput* track, Block* block, Block* before, Block* after, QUndoCommand* parent = nullptr);
+  TrackInsertBlockAfterCommand(TrackOutput* track, Block* block, Block* before, QUndoCommand* parent = nullptr);
 
   virtual void redo() override;
   virtual void undo() override;
@@ -121,7 +121,6 @@ private:
   Block* block_;
 
   Block* before_;
-  Block* after_;
 };
 
 /**