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bug#29630: 25.3; Unable to change fontset using :family face attribute
From: |
Eli Zaretskii |
Subject: |
bug#29630: 25.3; Unable to change fontset using :family face attribute |
Date: |
Sun, 10 Dec 2017 19:24:26 +0200 |
> From: Thomas Morgan <tlm@ziiuu.com>
> Date: Sat, 09 Dec 2017 16:26:48 -0500
>
> The documentation for the :font attribute doesn't say that it can
> be a fontset. But (elisp)Font and Color Parameters says the `font'
> frame parameter can be the name of a fontset and the frame parameter
> is "equivalent to the `font' attribute of the `default' face". So
> one can infer that the :font attribute of a face can be a fontset
> name. I tested this:
>
> (progn
> (set-face-attribute 'default nil :font
> "-*-liberation
> mono-normal-normal-normal-*-*-*-*-*-m-0-fontset-liberation")
> (font-at 0 nil "a"))
>
> This changes the font to Liberation Mono as expected:
>
> #<font-object "-1ASC-Liberation
> Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1">
>
> I also tried equivalent expressions with set-face-font and
> using the fontset alias, all of which succeeded.
>
> The font is correct but the fontset is actually fontset-auto1,
> not fontset-liberation. I'll make another report about that.
>
> I think the documentation for the :family attribute should be
> changed to explain how to refer to a fontset if it's possible
> to do that. If it's not possible to specify a fontset with the
> :family attribute, the text about fontsets should be removed.
Thanks, I've updated the documentation to match what the code does.
I'm CC'ing Handa-san, who might know more about this, and maybe
explain how to fix the code to accept fontsets as value of :family.
Currently, it doesn't seem to work, and I don't know enough about this
to figure out whether it ever did or was supposed to. This whole area
of Emacs is awfully under-documented.