bug#22780: 25.1.50; wrong average width picked for bold face for 7x13 X11 font

[Philipp Stephani <p.stephani2@gmail.com>]

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Alex Khesin <alex@khesin.com> schrieb am Di., 23. Feb. 2016 um 08:20 Uhr:

> emacs 25 choses fonts with different average width for 7x13 font, making
> bold text take more horizontal space.  This is particularly a problem when
> using themes like https://github.com/bbatsov/zenburn-emacs which use bold
> to hihglight matching parenthesis in show-paren-mode, causing characters to
> shift as the cursor is moved from a parenthesis to a non-parenthesis
> character.
>
> Repro that demonstrates the problem in both 25 pretest 1 and current head
> (but is perfectly ok in emacs 24):
>
> $ emacs -Q --eval '(progn (set-face-font '\''default "7x13") (print
> (face-font "default")) (print (face-font "bold")))'
>
> shows
>   -misc-fixed-medium-r-normal--13-120-75-75-c-70-iso8859-1
>   -misc-fixed-bold-r-normal--13-120-75-75-c-80-iso8859-1
>
> Notice the jump from 70 to 80 before the iso8859 component - that's the
> average width, and that's what I believe is causing bold characters to
> render wider than non-bold ones.  Both are 70 in emacs 24.
>
>
This appears to be a regression from Emacs 24. Would be great if somebody
who has knowledge about this area could look into this.

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