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bug#15273: 24.3.50; Combining character sequences are displayed weirdly


From: Andreas Schwab
Subject: bug#15273: 24.3.50; Combining character sequences are displayed weirdly
Date: Fri, 06 Sep 2013 08:42:23 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

> Character composition in Emacs can happen in 1 of 2 ways:
>
>  . The font driver tells Emacs to compose several characters into a
>    single grapheme cluster, by drawing all of them as a single unit,
>    and by drawing the 2nd, 3rd, etc. character glyphs at certain pixel
>    offsets relative to the base glyph.
>
>  . Emacs itself has composition rules for 2 or more characters; in
>    this case, the same pixel offsets come from those rules.

The first way can only work if both characters are coming from the same
font.  Not sure if that is also true for the second way, but I'd guess
yes.

Andreas.

-- 
Andreas Schwab, address@hidden
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