[Qt-creator] Collapsed lines deleted on build

[Bob Babcock]

I've had multiple instances of collapsed functions disappearing in Qt 
Creator 2.0.80 under Windows XP.  Just now, I actually saw it happen, as 
opposed to finding the code gone and wondering what happened.  I clicked on 
the build icon and the first instance of collapsed code disappeared and the 
edit window underlined the remaining first line in red indicating a syntax 
error.  Control-z brought back the deleted lines.  Anyone else seen this?  
I don't see any reports in the bug tracker.