Re: [PATCH] Recompute glyph metrics when face changes

Wednesday, 2 February 2000

        "Kirill 'Big K' Katsnelson" <kkm(a)dtmx.com&gt; writes:

...
 Some time ago, Kyle Jones wrote...
 >An image instance might be invalidated by a face change also.
 >For instance XPM images can have a transparent background and
 >therefore inherit their background color from the glyph's face.
 >So this is a general problem that we have to solve. 

 Oh, I missed that. Won't be hard. I can merely relax the checks,
 causing more glyphs to be recomputed. Perhaps all, changing faces is
 a rare operation, and often leads to the total redisplay anyway. 
Please be careful about these things.  There are many operations that
cause a complete redisplay in XEmacs that could be optimized away, and
it often causes unnecessary flicker.

For instance, some time in the 21.2 beta cycle, a new flicker was
added when you leave the minibuffer.  Something like `M-: C-g' redraws
the whole frame after the C-g.  This is especially annoying under
TTY's.

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