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bug#39799: 28.0.50; Most emoji sequences don’t render correctly

From: Mike FABIAN
Subject: bug#39799: 28.0.50; Most emoji sequences don’t render correctly
Date: Sat, 29 Feb 2020 08:50:40 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Eli Zaretskii <address@hidden> さんはかきました:

>> From: Robert Pluim <address@hidden>
>> Cc: address@hidden,  address@hidden
>> Date: Fri, 28 Feb 2020 22:47:36 +0100
>> -fn "Noto Color Emoji" doesnʼt change the default font for me for some
>>  reason, but if I change the font after startup then those sequences
>>  display correctly.
>>   (char-table-range composition-function-table #xFE0F)
>> => ([".." 1 compose-gstring-for-variation-glyph])
> OK, so this feature already works for suitable fonts.
>> and #xFE0F is always composable according to composite.c, so I donʼt
>> understand why composing only works with Noto Color Emoji. Or does the
>> font need specific support for it?
> Yes, the font needs to have glyph variations, see
> font-variation-glyphs and its underlying font-backend method
> get_variation_glyphs.


doesn’t seem to say that the fonts should have the variations.

Mike FABIAN <address@hidden>

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