Commit: Fix 4811 annoying screen flicker on linux.

From: msevior@physics.unimelb.edu.au
Date: Wed Apr 09 2003 - 12:44:09 EDT

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CVS: ----------------------------------------------------------------------
CVS: Enter Log. Lines beginning with `CVS:' are removed automatically
CVS:
CVS: Committing in .
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CVS: Modified Files:
CVS: src/af/xap/unix/xap_UnixFrameImpl.cpp
CVS: src/text/fmt/xp/fv_View_protected.cpp
CVS: ----------------------------------------------------------------------
Fix bug 4811. Annoying screen flicker gone on linux.

This was caused by a bug gtk2. Focus-in events on our drawing area were
generating expose events on our drawing area which in turn resulted in the
screen being cleared and completely redrawn.

Simple work around of returning TRUE in the focus-in handler to prevent
the expose event being generated. Thanks to Bernhard Herzog, author of the
fantastic Vector Graphic App, sketch, for the clue.

Martin

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