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Re: 23/NS: redraws according to mouse-face are slow

From: David Reitter
Subject: Re: 23/NS: redraws according to mouse-face are slow
Date: Mon, 20 Apr 2009 14:01:17 -0400

On Mar 4, 2009, at 4:29 PM, Adrian Robert wrote:

I find that the redisplay of overlays that happens when the mouse is
moved into an overlay with a mouse-face property are much slower in
Emacs 23 (NS, under Cocoa/OS X).  It is pretty much a nasty animation
- every layer is redrawn from left to right, it seems, and every step
is visible.  It seems that background is drawn first, and then the
text over it.

Yes, this has been an issue for years from Emacs on Aqua on and it completely baffles me. The NS code for handling mouse face is identical to other platforms as far as I can tell, so I don't know why the issue occurs only here. And the animation is far slower than any code on the NS side could be taking. It must be a bug somewhere on the core display side that is exposed because (guessing here) the event loop under NS is done slightly differently.

Does anyone have an idea how to fix issue 2530? I think this slowness is quite painful. In my case, it is the tabbar.el variant that I'm using that causes this - I'm using several overlays (for a tab-close button, for instance) that get redrawn one by one. I would imagine that this will annoy users in other use cases as well.

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