[525473] [Papyrus] Connections disappear when comparing multiple diagrams

Clean up all traces of the previous diagram contents when replacing the
diagram merge viewer's content by another diagram.

Bug: 525473
Change-Id: Id716ffc32e789fc5cf326c7dc86a53e0a6d51d90
Signed-off-by: Christian W. Damus <give.a.damus@gmail.com>
1 file changed