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bug#57066: 29.0.50; Complex emoji overlaps with text

From: YAMAMOTO Mitsuharu
Subject: bug#57066: 29.0.50; Complex emoji overlaps with text
Date: Thu, 11 Aug 2022 16:23:47 +0900
User-agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (Gojō) APEL-LB/10.8 EasyPG/1.0.0 Emacs/28.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) 
On Thu, 11 Aug 2022 15:49:10 +0900,
Eli Zaretskii wrote:
> 
> Do other font backends that use HarfBuzz need something similar, or is
> this specific to the ftcrhb backend?

The xfthb font backend driver does not need the similar change since
it always uses 1.0 / (1 << 6) as the position unit, just like the
patched ftcrhb code for HarfBuzz 5 and later.

I'm not familiar with the harfbuzz driver on W32.  But at least, the
bug#489 on HarfBuzz is about hb-ft.cc.  So probably the
uniscribe-specific part is not affected.

                                     YAMAMOTO Mitsuharu
                                mituharu@math.s.chiba-u.ac.jp
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