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bug#13011: 24.2; Text flickering moving cursor with box around text enab
From: |
Stefan Monnier |
Subject: |
bug#13011: 24.2; Text flickering moving cursor with box around text enabled |
Date: |
Thu, 29 Nov 2012 14:06:07 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
> area. The vertical (left and right) borders of the box are drawn
> in the same way as when this value is positive. */
> int box_line_width;
[...]
> I made a provisional change that behaves with left and right borders
> like it does with horizontal ones, and it seems to work, at least with
> character display (didn't text with images, image slices, composite
> characters, etc.). But I'd like to ask Handa-san (CC'ed), who wrote
> the code for this feature (almost 12 years ago!), whether he might
> remember why the code deliberately makes the left and right borders
> behave differently from top and bottom ones.
I'm curious as well. The only think that comes to mind is that in most
fonts, there's usually some empty pixel-line(s) at the top and the
bottom, whereas there often't isn't any empty pixel-lines at all on the
left (and/or on the right) side. So there's more risk of overwriting
useful pixels on the left&right than at top&bottom.
Stefan