ViewComposerTest leaks ShellViews and a drag drop session.
ViewComposerTest leaks ShellViews and a drag drop session.

ViewComposerTest performs some drops using the VCs private drop event
handlers incorrectly and drops some views over the desktop, which causes
the VC to discard its currently composed Shell. This isn't a good test,
and also leaks. Fixed it to use the D&D operation as intended.

blairmcg/Dolphin,objectarts/Dolphin,blairmcg/Dolphin,jgfoster/Dolphin,dolphinsmalltalk/Dolphin,shoshanatech/Dolphin,shoshanatech/Dolphin,dolphinsmalltalk/Dolphin,blairmcg/Dolphin,jgfoster/Dolphin,jgfoster/Dolphin,shoshanatech/Dolphin,objectarts/Dolphin,dolphinsmalltalk/Dolphin,shoshanatech/Dolphin,blairmcg/Dolphin,dolphinsmalltalk/Dolphin,jgfoster/Dolphin