Mintty text glitches when using up key

[Hamish McIntyre-Bhatty]

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.

>>> 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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