bug#35129: Unsupported escape sequences for progress in shell

[Michael Albinus]

Juri Linkov <juri@linkov.net> writes:

Hi Juri,

>> Some escape sequences are unhandled in shell mode.
>> Most often they appear when running `apt install'
>> that shows its progress bar that is supposed to stay
>> on the same line, but spreads over several lines,
>> so the output looks like a mess (where ^[7 and ^[8
>> are escape sequences currently still unhandled):
>
> After more research, I found an interesting post
> https://oremacs.com/2019/03/24/shell-apt/
> that proposes a promising way to handle
> these escape sequences.
>
> So maybe this should be customizable?

Looks interesting. However, we have `progress-reporter'. The code from
above shall be made available via this.

This would also improve Tramp; there are requests to integrate the
progress reporter from external commands.

Best regards, Michael.