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bug#37806: 27.0.50; Need to "extend" face-remap.el
From: |
Stephen Berman |
Subject: |
bug#37806: 27.0.50; Need to "extend" face-remap.el |
Date: |
Sun, 20 Oct 2019 14:21:50 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
On Sat, 19 Oct 2019 20:33:33 +0300 Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Stephen Berman <stephen.berman@gmx.net>
>> Date: Fri, 18 Oct 2019 11:14:09 +0200
>>
>> 0. emacs -Q
>> 1. C-x C-+ (i.e. M-x text-scale-adjust)
>> 2. M-x variable-pitch-mode or M-x buffer-face-mode
>> => Args out of range: [nil :family :foundry :swidth :height :weight :slant
>> :underline :inverse :foreground ...], 19
>>
>> The error happens because the vector of face attributes defined in
>> face-remap.el is missing the recently added :extend attribute, so it is
>> too short. This also breaks the MELPA package charmap.el (that's where
>> I hit the error). The patch below fixes this, though perhaps now would
>> be a good time to do what the comment above the definition of the vector
>> says: "This variable should probably be defined in C code where the
>> actual definitions are available." Or is this simple fix good enough?
>>
>> (The vector is also missing the :distant-foreground attribute, so the
>> patch adds that as well. This absence happened to be innocuous because
>> the first element of the vector is nil, in order to make the attribute
>> indices match those of the enum lface_attribute_index defined in
>> dispextern.h, so the vector was long enough; but after the addition of
>> the :extend attribute, it wasn't anymore (only the indices of the vector
>> are used in face-remap.el).)
>>
>> In GNU Emacs 27.0.50 (build 17, x86_64-pc-linux-gnu, GTK+ Version 3.24.5,
>> cairo version 1.16.0)
>> of 2019-10-18 built on strobe-lfs84
>> Repository revision: 2d13a3f68d4724af52e47675bedf60709c7b5171
>> Repository branch: master
>> Windowing system distributor 'The X.Org Foundation', version 11.0.12003000
>> System Description: Linux From Scratch
>>
>>
>> diff --git a/lisp/face-remap.el b/lisp/face-remap.el
>> index 5cdecb92ee..8e565264fe 100644
>> --- a/lisp/face-remap.el
>> +++ b/lisp/face-remap.el
>> @@ -69,7 +69,7 @@ internal-lisp-face-attributes
>> [nil
>> :family :foundry :swidth :height :weight :slant :underline :inverse
>> :foreground :background :stipple :overline :strike :box
>> - :font :inherit :fontset :vector])
>> + :font :inherit :fontset :distant :extend :vector])
>>
>> (defun face-attrs-more-relative-p (attrs1 attrs2)
>> "Return true if ATTRS1 contains a greater number of relative
>
> Thanks.
>
> Jimmy, could you please take a look?
This bug (and bug#37824, which is the same) isn't due to the addition of
the :extend attribute per se, but to that addition increasing the length
of lface_attribute_index, which makes it necessary to adjust the length
of internal-lisp-face-attributes, only the indices of which
face-remap.el actually uses, as I noted above. Indeed, the following
patch also fixes this bug:
diff --git a/lisp/face-remap.el b/lisp/face-remap.el
index 5cdecb92ee..e429752df9 100644
--- a/lisp/face-remap.el
+++ b/lisp/face-remap.el
@@ -66,7 +66,7 @@
;; definitions are available.
;;
(defvar internal-lisp-face-attributes
- [nil
+ [nil nil
:family :foundry :swidth :height :weight :slant :underline :inverse
:foreground :background :stipple :overline :strike :box
:font :inherit :fontset :vector])
But then we might as well just use a vector with all nil (or arbitrary)
elements whose length is LFACE_VECTOR_SIZE (maybe that's even how the
comment in face-remap.el quoted above could be understood).
The simplest fix is to just add the missing attributes, as my first
patch does, but then on any future changes to lface_vector_size
internal-lisp-face-attributes will have to be correspondingly adjusted.
Steve Berman