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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: Sat, 13 Jun 2015 10:10:05 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

Eli Zaretskii wrote:
Actually, an even better solution might be this: we explicitly specify
fixed-medium font with iso10646-1 registry for these popular
characters_before_  Symbola.  This is justified, I think, since the
standard-fontset-spec on X specifies a fixed-medium font, so fit is
iso10646-1 variant supports these commonly-used punctuation
characters, it is a better candidate than Symbola, while the latter
will still be used as fallback.

WDYT?  Could you try this on your system and see if it work?

I'd be happy to try, but I'm afraid this is an area I don't know well and I don't see why the existing code doesn't already do what you'r suggesting. setup-default-fontset invokes (set-fontset-font "fontset-default" ... "Symbola" nil 'prepend), and later invokes (set-fontset-font "fontset-default" nil '(nil . "iso10646-1") nil 'prepend), so doesn't that mean that the iso10646-1 fonts are prepended before Symbola and so should take priority over Symbola already?

Anyway, If you can send me a patch along the lines you're thinking, I can try 

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