Hello - I am the author of a TUI library and received a bug report regarding
cursor placement on exiting an application.
I was able to narrow down a simple reproducer to how st a XTSMGRAPHICS query:
echo -e "\x1b[?2;1;0S"
This can also be seen when using a notcurses application which *doesn't* enter
the altscreen (ie `ncls`). notcurses does the XTSMGRAPHICS query in the alt
screen (which is also the solution I will be using), but `ncls` uses notcurses
direct mode, which never enters the alt screen thus this bug appears there as
well.
I checked the source and it looks like the parser is not checking for a private
indicator when handling a CSI with final character S. In that case, this query
gets parsed as a SU sequence. I think that ought be modified to ensure there
isn't a '?' private indicator in the sequence before handling as SU.
Not much of a C programmer but I could take a shot at this if the solution
sounds ok.
--
Tim
Received on Sun Feb 18 2024 - 03:45:44 CET