Web lists-archives.com

Re: *cause of* screen writing over restored buffer on detach/exit




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

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple