[Libreoffice-bugs] [Bug 134226] Arabic diacritics misplaced when "fall-back" font is used

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=134226

--- Comment #9 from Ming Hua <ming.v.hua at qq.com> ---
First, I can reproduce both the problematic rendering like the screenshot in
attachment 162301 and the "workaround" mentioned in comment 3 (choose text,
re-assign font Arial, the rendering becomes correct) with 6.4.7 on Windows:
Version: 6.4.7.2 (x64)
Build ID: 639b8ac485750d5696d7590a72ef1b496725cfb5
CPU threads: 2; OS: Windows 10.0 Build 18363; UI render: default; VCL: win; 
Locale: zh-CN (zh_CN); UI-Language: en-US
Calc: threaded

Second, I question Eyal's judgement that this is caused by fall-back font.  Not
that I know any Arabic myself, but to my layman's eyes, the Arabic is rendered
very similarly on my Windows as Eyal's screenshot, and Eyal says:

(In reply to Eyal Rozenberg from comment #8)
> By the way, perhaps I should mention I also
> have the X font cache look at a Windows installation's font directory; and I
> have a few fonts I've installed myself (not Arial of course).
But any Windows installation should have Arial font installed.  So I checked my
Arial font, it does contain Arabic glyphs, and they look just like how the
sample document is rendered in LO (and Eyal's screenshot).

I therefore contend that this has nothing to do with fall-back font, but about
rendering of Arial font when it's used by default (instead of by direct
formatting).

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