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To: cygwin AT cygwin DOT com
From: Andrew Schulman <schulman DOT andrew AT epa DOT gov>
Subject: Re: *cause of* screen writing over restored buffer on detach/exit
Date: Wed, 10 Apr 2019 11:04:01 -0400
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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>
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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.

So I'll upload a test release, to see if we can get some other people to
test.

Andrew


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