[Audacity-quality] Crash clicking between labels on Windows (Bug 705 fix)

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2.0.6-alpha Windows 7. Unmodified HEAD. 

1 Launch Audacity.
2 Generate  > Tone  30 seconds.
3 Drag a selection about 5 seconds to 10 seconds, CTRL + B
   to label, drag a selection about 20 to 25 seconds, CTRL + B
   to label. 
4 Double-click between the labels. Crashes every time. 

The problem seems to lie in Steve's fix for Bug 705 (envelope
points not deleted correctly):
http://code.google.com/p/audacity/source/detail?r=13076 .

Reverting that commit cures the crash on Windows. 

Not tested if the crash occurs on Linux or Mac.




Gale