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Subject:	Re: *cause of* screen writing over restored buffer on detach/exit
To:	cygwin AT cygwin DOT com
References:	<56fced2e-4f98-7bba-136b-5eeded34ce6f AT shaddybaddah DOT name> <6cc3bc5e-2c3c-61a1-8473-8c531faceac7 AT shaddybaddah DOT name> <b0290101-3511-9ffb-91d3-e88afdbe9df1 AT shaddybaddah DOT name> <990saedodb302s3fr7me8j2befc9pdam97 AT 4ax DOT com>
From:	Thomas Wolff <towo AT towo DOT net>
Message-ID:	<fdbb0b82-f47d-3eb9-ed81-7d6765258b8f@towo.net>
Date:	Wed, 10 Apr 2019 19:12:52 +0200
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Am 10.04.2019 um 17:04 schrieb Andrew Schulman:
> Hi Shaddy. There you go again.
>
>> The reason seems to be that the Debian screen package packages a custom
>> /etc/screenrc that does not include this explicit term capability:
>>
>>
>> #
>> # Do not use xterms alternate window buffer.
>> # This one would not add lines to the scrollback buffer.
>> termcap xterm|xterms|xs ti=\E7\E[?47l
>> terminfo xterm|xterms|xs ti=\E7\E[?47l
>>
>>
>> If I comment these out, my screen issue is resolved.
>>
>> I'm not suggesting this is a problem with Cygwin screen... it is using
>> the upstream settings. In fact, I am not confident to say where the
>> fault lies. Perhaps screen is right to use these sequences, but the
>> xterms used (putty and mintty) aren't doing the right thing?
>                      
> I haven't seen the screen corruption you describe - not sure why. So it's
> hard for me to test the fix. But I did comment out those 2 entries, start a
> new screen, and attach and detach several times, and it doesn't seem to
> cause any harm.
>
> I don't know whose fault the problem is either, but it's probably a
> particularity of Cygwin. So I'm happy to package the fix as long as it
> doesn't create any problems.
screen sends CSI ? 1049l on exit which restores the cursor to the 
position where it was previously saved.
It's the "te" (not ti) terminfo sequence for xterm on cygwin.
Thomas

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