More vertical tree diagram bugs

[JayHollingsworth]

Copying class diagram fragments with vertical tree line style fails

To see this:
1 Create a new model and class diagram
2 Add three classes laid out in a triangle
3 Make the top class a generalization of the two bottom classes
4 Right-click on the connectors to make their Line Styles be Tree Style - Vertical
5 Copy just the left half of the diagram (i.e., the parent and one child) and paste it into Powerpoint
6 Copy and paste the right half of the document (i.e., the parent and the other child) into Powerpoint
7 One of the two pasted diagrams will be missing the shared part of the line and the open arrowhead at the top.

In my tests, the one which is drawn first will copy/paste correctly. The one drawn second fails to paste correctly.

If I draw three classes only the first one pastes correctly. All later ones fail.

I filed a bug report, but if anyone knows a workaround please let me know.