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Subject:	Re: Mintty text glitches when using up key
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From:	Thomas Wolff <towo AT towo DOT net>
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Date:	Fri, 28 Aug 2020 17:13:50 +0200
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Am 28.08.2020 um 16:31 schrieb Hamish McIntyre-Bhatty via Cygwin:
> On 28/08/2020 09:33, Thomas Wolff wrote:
>> Am 27.08.2020 um 21:55 schrieb Brian Inglis:
>>> On 2020-08-27 10:55, Hamish McIntyre-Bhatty via Cygwin wrote:
>>>> For a while I've noticed that if I run a long command (usually has to
>>>> wrap to next line down), that my Mintty session often becomes all
>>>> messed
>>>> up if I use the up arrow keys to try and run it again later. Has anyone
>>>> else experienced this?
>> This description is quite fuzzy. It could be that you resized the
>> window while a program was running, or that some background process
>> sends output to the screen asynchronously. In such cases, the shell
>> loses track of the cursor position and line editing fails. That's not
>> a terminal issue.
>>
> My apologies. I mean when a the command with its arguments are long
> enough to wrap around the width of the Mintty window.
That works fine normally but fails under certain additional conditions. 
Please provide a reproducible test case in order to get suitable 
comments. Also, which shell do you use?
Thomas


>>>> Another, probably unrelated, observation is that if a command
>>>> produces a
>>>> lot of long lines that get wrapped, if I make the Mintty window wider,
>>>> the lines stay wrapped. This behaves much like other terminal emulators
>>>> I used in the past, including gnome-terminal. At some point, this was
>>>> fixed in gnome-terminal, so I wonder if that fix would be relevant
>>>> here too.
>> This was requested to mintty already
>> (https://github.com/mintty/mintty/issues/82) but it's not a
>> traditional terminal feature, so if some terminals have added it as an
>> enhancement, that's not a "fix".
>> Thomas
>>
> Good to know.
>>>> Unfortunately I know precious little about how terminal emulation works
>>>> so I'm not likely to be able to provide a fix, but I'm interested to
>>>> see
>>>> if anyone else has experienced this or has found workarounds. It seems
>>>> to happen with both 32-bit and 64-bit Cygwin for me.
>>> Not a problem with long lines - often find myself editing a few lines
>>> down in a
>>> few hundred characters long after some iterations - I type without
>>> thought:
>>>
>>>      $ history | tail > ~/bin/script
>>>      $ vim + !$
>>>
>>> Problem is when you type ahead too fast, hit modifier keys and/or
>>> special
>>> functions by mistake in the wrong place, and/or when something else
>>> is running
>>> in the background, or the system is loaded, and mintty does not grab
>>> the whole
>>> escape sequence to process; often just running reset will restore
>>> sanity.
>>>
>>> [For real fun with mintty, type: $ echo `/usr/bin/env /usr/bin/python`
>>> You can kill python from another terminal window or TaskMgr.]
>>>
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