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Re: Redisplay problems?

From: Stefan Monnier
Subject: Re: Redisplay problems?
Date: Thu, 20 Mar 2014 17:00:49 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

> But it's a redraw when we expose a hitherto invisible/obscured frame
> whose contents have changed while it was invisible/obscured.

Yes, of course, but you can look at it as "deiconify with the old
display content" (without recomputing matrices nor redrawing) followed
by a normal redisplay (which may recompute matrices and/or redraw
depending on whether something actually did change while the frame was

>> Part of the reason it's still fuzzy is that xdisp.c seems to recompute
>> the matrices when it finds a "garbaged" frame,
> But we do have to compute the new matrices to know whether they have
> changed.  I'm fully confused now.

No, if the "redisplay" bits are "false" we know that nothing has changed.


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