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X-HELO:	mout.kundenserver.de
Subject:	Re: Cygwin fails to utilize Unicode replacement character
To:	cygwin AT cygwin DOT com
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From:	Thomas Wolff <towo AT towo DOT net>
Message-ID:	<9def52c2-f547-8300-1faa-e71bfd3fd2d4@towo.net>
Date:	Sat, 1 Sep 2018 23:07:14 +0200
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Am 01.09.2018 um 20:46 schrieb Steven Penny:
> On Sat, 1 Sep 2018 20:11:15, Thomas Wolff wrote:
>> Which terminals are used and what's the output of `locale` and `cat 
>> --version` in both cases?
>
> ...
>
> Note that in addition to Linux, Windows PowerShell also gives correct 
> output:
>
>    $ pwsh -c '[system.text.encoding]::UTF8.getString(0xEB)'
>    �
What makes you claim this would be the "correct output"? Where is this 
defined?

> compare again with Cygwin:
>
>    $ printf '\xEB'
>    ▒
Actually, in mintty, this is not (anymore) the MEDIUM SHADE. Please compare.
There's also a problem with using MEDIUM SHADE. In an ambiguous-width 
locale (or explicit ambiguous-width terminal mode), that character has 
double-width and is therefore not suitable as a replacement for a single 
illegal UTF-8 byte.
Cygwin console does not support double-width so it does not have this 
problem, but until further clarification I think I'll not change it in 
mintty.
Thomas

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