in reply to Re^4: Perl/Tk window contents disappear when obscured then revealed
in thread Perl/Tk window contents disappear when obscured then revealed

the task of redrawing a window when it is revealed is down to the window manager, not the application
When Firefox freezes (happens to me sometimes when running adobe flash plugin), its window becomes completely gray. I can switch to other applications, but Firefox does not update its windows. I fear you are not right here.
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Re^6: Perl/Tk window contents disappear when obscured then revealed
by Anonymous Monk on Feb 01, 2013 at 12:22 UTC
    If you want to see this in action, install http://maf.mozdev.org/ and save a file -- maf slows things down and blocks