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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: Sun, 14 Jun 2015 09:14:27 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

Eli Zaretskii wrote:

After trying it a bit I'm worried that this will be flaky.  Often the Symbola
fonts are better (much better, if the default fonts lack the symbols), often
worse (if both fonts have the symbols), and it all depends on a lot of settings.

What settings are those?  The only ones I think are relevant are the
default fontset and the default font.  Are there any others?

I'm not sure, but I found that my ~/.emacs file, at the end, said "(custom-set-faces)" -- something I didn't put in there, but I suppose I ran "customize" at some point in the unremembered past, though I don't remember ever customizing fonts. I suppose the settings installed by custom-set-faces, whatever they are, alter the fonts installed by the recent change, and this messes up my testing. (Possibly they saved faces calculated *before* the recent change to Emacs, and custom-set-faces is trying to restore them?) I will comment out the customization code before doing further testing, but these are the sorts of glitches that I fear will affect other users.

I took a look at your recent commit 2f09f8952489b5c90488faf66f71a4252aed5c2c and things are better on Ubuntu, thanks. In my default environment it now uses the fixed font so the Symbola stuff doesn't get in the way. I'll try it out on Fedora in a couple of days.

I did try it with emacs -Q to get the Ubuntu 15.04 default font (Ubuntu Mono), and found that recent Emacs in many places looks nicer and in some places not as good. Focusing on the latter:

U+201F DOUBLE HIGH-REVERSED-9 QUOTATION MARK now displays as xft:-unknown-Symbola-normal-normal-semicondensed-*-17-*-*-*-*-0-iso10646-1 (#x39B) which is spidery, whereas it formerly displayed as xft:-unknown-FreeMono-normal-normal-normal-*-17-*-*-*-m-0-iso10646-1 (#x8A8) which is more legible.

U+204F REVERSED SEMICOLON has a similar problem.

are too large in Symbola; the old FreeMono version was better.

The currency symbols look worse than before: they used to be constant-width (most of them anyway) and matched Ubuntu Mono better. Perhaps we should leave them alone?

Thanks for doing all this -- it must have taken you quite some time.

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