shifted IC unblocking until after the split is done since the clips won't change

app/node/block/block.cpp

@@ -224,7 +224,6 @@ rational Block::MediaToSequenceTime(const rational &media_time) const
 void Block::CopyParameters(const Block *source, Block *dest)
 {
   dest->set_block_name(source->block_name());
-  dest->set_media_in(source->media_in());
 
   if (source->type() == kTransition && dest->type() == kTransition) {
     const TransitionBlock* src_t = static_cast<const TransitionBlock*>(source);

app/widget/timelinewidget/undo/undo.cpp

@@ -418,15 +418,14 @@ void BlockSplitCommand::redo()
   new_block_->set_media_in(block_->media_out());
   new_block_->set_media_out(original_media_out);
 
-  // Will re-parent new_block_ to the track's graph
   track_->InsertBlockAfter(new_block_, block_);
 
-  track_->UnblockInvalidateCache();
-
   foreach (NodeInput* transition, transitions_to_move_) {
     NodeParam::DisconnectEdge(block_->output(), transition);
     NodeParam::ConnectEdge(new_block_->output(), transition);
   }
+
+  track_->UnblockInvalidateCache();
 }
 
 void BlockSplitCommand::undo()
@@ -438,12 +437,12 @@ void BlockSplitCommand::undo()
 
   TakeNodeFromParentGraph(new_block_, &memory_manager_);
 
-  track_->UnblockInvalidateCache();
-
   foreach (NodeInput* transition, transitions_to_move_) {
     NodeParam::DisconnectEdge(new_block_->output(), transition);
     NodeParam::ConnectEdge(block_->output(), transition);
   }
+
+  track_->UnblockInvalidateCache();
 }
 
 Block *BlockSplitCommand::new_block()