Re: Emacs and Gnome Canvas

[Davis Herring]

> What does "replaced with addition of the dirty area" mean?  The X
> server only sends expose events when it thinks that a (part of) an X
> window needs to be redrawn, for example when resizing.

I think it means "inform the X server that a region needs to be redrawn,
as if it had just been exposed".  I don't know if X even supports this
idea, but I know it from Java:
<http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Component.html#repaint%28int,%20int,%20int,%20int%29>.
 That method arranges for a repaint to occur, but returns immediately; the
painting happens in response to the artificial expose-like event created. 
(Such events may then be intelligently coalesced by the toolkit to paint
larger areas in one pass.)

Davis

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