IU-96.1121 Overlapping some other app over IDEA's editor panel is triggering a complete reparse of the source file!

I'm seeing a problem with IDEA editor in IU-96.1121.  If I bring another application into the foreground, it is causing the IDEA editor to reparse the sourcefile each time.
This is 100% reproducible for me.  Windows 2008 R2 x64, JDK 1.6.0_20, IU-96.1121.

I have captured a cpu snapshot and filed a youtrack.

IDEA-58558 [performance] Overlapping some other app over IDEA's  editor panel is triggering a complete reparse of the source file!

Thanks,

-Alex