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bug#20727: 24.5; Font fallback doesn't work for the Emoji range


From: Paul Eggert
Subject: bug#20727: 24.5; Font fallback doesn't work for the Emoji range
Date: Fri, 12 Jun 2015 13:57:26 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

The recent change to fontsel.el messed up my display when I was trying to test obsolescent 8-bit environments. I can reproduce the problem on Fedora 21 x86-64 by running:

src/emacs -Q -font -misc-fixed-medium-r-semicondensed--0-0-75-75-c-0-iso8859-1

and then by typing:

abc C-x 8 [ def C-x 8 ] ghi

This inserts "abc‘def’ghi" into *scratch*. The display looks like "abc ‘def’ ghi" with huge spaces around the quotes (see attached screenshot). There are similar problems with many other characters. Apparently this is because I don't have the Symbola font installed, so the change caused Emacs to fall back on Chinese double-width quotes rather than on the font it used before (which is -misc-liberation serif-medium-r-normal--13-94-100-100-p-74-iso10646-1 for the above invocation of Emacs).

I imagine that there will be similar problems with choosing Symbola even if it's available, as users may prefer the font they've selected explicitly, so perhaps the change should be enabled only for characters that are not already available in the user-selected font? In the meantime, in master commit 203e84c6cf9b8356e376cc748b5ed331df96dc9e I worked around my problem by skipping the change if Symbola is not installed.

Attachment: Screenshot from 2015-06-12 12:59:19.png
Description: PNG image


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