From: handa@gnu.org (K. Handa)
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: 17973@debbugs.gnu.org
Subject: bug#17973: Thin space not thin at all
Date: Thu, 10 Jul 2014 00:32:33 +0900 [thread overview]
Message-ID: <87d2deeeem.fsf@gnu.org> (raw)
In-Reply-To: <jwv1ttvpvuu.fsf@iro.umontreal.ca> (message from Stefan Monnier on Tue, 08 Jul 2014 14:07:53 -0400)
In article <jwv1ttvpvuu.fsf@iro.umontreal.ca>, Stefan Monnier <monnier@iro.umontreal.ca> writes:
> % emacs-24/src/emacs -Q -fn '-misc-fixed-*-r-semicondensed--13-*-*-*-*-*-*'
> M-< C-f C-x SPC
> At this point I should see a thin space before the cursor (highlighted
> with the region face). Instead I see a full space.
> C-u C-x =
> indeed shows that there's an overlay at point with an after-string of:
> #(" " 0 1 (face (region (:height 0.2))))
> Now admittedly, ":height 0.2" does not specify a width, but Emacs should
> be able to find a font that's about 2½ pixels high but not
> 6 pixels wide.
> This is related to bug#16403, in that this is probably a long-standing
> bug, but the new rectangular region makes it more visible.
> Maybe it's actually the same bug as bug#9787 as well, which is also more
> visible since *VC-log* uses such a "thin line" to separate the header
> from the body.
Yes, I agree that they are all the same bug. As far as I
know, the problem is with the mechanism of face attribute
merging. When the control reaches the font selection
function font_find_for_lface, font related attributes
(family, foundry, weight, ..., height, ...) are already
merged. As font_find_for_lface doesn't know which attribute
to respect more (except for what specified in
face-font-selection-order), it at first tries to get a list
of fonts whose family, foundry, registry, adstyle are the
same as merged attributes, and selects a font most close to
the specified height.
To fix this problem, perhaps we must propagate the
information about how font related attributes are merged;
i.e. which one comes from the specific face directly and
which one is inherited from the other faces (including the
default face). It's not a trivial work.
---
Kenichi Handa
handa@gnu.org
next prev parent reply other threads:[~2014-07-09 15:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-08 18:07 bug#17973: Thin space not thin at all Stefan Monnier
2014-07-09 15:32 ` K. Handa [this message]
2014-07-09 19:21 ` Stefan Monnier
2014-07-10 14:28 ` K. Handa
2014-07-10 16:37 ` Stefan Monnier
2014-07-13 15:12 ` K. Handa
2014-07-19 6:13 ` Stefan Monnier
2014-07-19 15:57 ` K. Handa
2014-07-19 17:30 ` Stefan Monnier
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