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Subject: Re: pseudo console and auto-wrap
To: cygwin AT cygwin DOT com
References: <0c9fd8af-bb5a-0d15-5a5a-3fc739d3e6cd AT towo DOT net> <20200306005122 DOT 52a9b50615a16546e60defc1 AT nifty DOT ne DOT jp> <CANV9t=RVqXc47uzCb0GUiZKxAx-tGHxD5qM2adv7bnZ486tWsA AT mail DOT gmail DOT com>
From: Thomas Wolff <towo AT towo DOT net>
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Date: Fri, 6 Mar 2020 21:43:29 +0100
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Am 06.03.2020 um 19:45 schrieb Bill Stewart:
> On Thu, Mar 5, 2020 at 8:52 AM Takashi Yano wrote:
>
>> Thomas Wolff wrote:
>>> With ConPTY support, the following command results in output that
>>> contains an explicit newline at the auto-wrap position:
>>> cmd /c echo a line which is wider than your terminal ...
>>>
>>> For copy/paste, this is surprising and undesired
>>> (https://github.com/mintty/mintty/issues/971).
>>> Can the line wrapping case be handled specifically, assuming proper
>>> auto-wrap mode on the terminal side, to avoid this?
>> This is internal behaviour of pseudo console.
>> So we can not touch it. WSL also behaves the same.
> Observations when I ssh to a Windows 10 1909 machine running cygwin
> 3.1.4/OpenSSH 8.2...
>
> I ran ssh-host-config and tested both with disable_pcon set in CYGWIN
> environment variable and without. (This sets REG_SZ value
> HKLM\SYSTEM\CurrentControlSet\Services\cygsshd\Parameters\Environment\CYGWIN=disable_pcon)
>
> With disable_pcon set:
>
> echo "$PATH"     -- wraps correctly
> cmd /c echo %PATH%     -- wraps correctly
> winpty cmd /c echo %PATH%     -- wrapping broken
>
> Without disable_pcon set:
>
> echo "$PATH"     -- wraps correctly
> cmd /c echo %PATH%  -- wrapping broken
> winpty cmd /c echo %PATH%     -- wrapping broken
>
> I would note that in both cases, winpty output is not correct.
>
> Does anyone have any ideas on how to fix it?
Note that winpty is obsolete under current cygwin, and the second cmd 
case is the only issue.
As Takashi explained, there is no fix on the cygwin side. It could be 
fixed on the Windows side, within the ConPTY API.
You could report it there...

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