patch 9.1.0321: Garbled output on serial terminals with XON/XOFF flow control
Problem: When used terminal with XON/XOFF flow control, vim tries to
still make CTRL-S mapping available, which results in severe
screen corruption, especially on large redraws, and even
spurious inputs (John Tsiombikas)
Solution: Disallow CTRL-S mapping if such terminal is recognized.
Don't remove IXON from the bitmask inversion.
(Anton Sharonov)
*** When started like this:
TERM=vt420 vim
:set termcap
shows "t_xon=y"
map <C-S> :echo "abc"<CR>
does nothing (after <C-S> output freezes and subsequent <C-Q>
unfreezes it)
*** When started like this:
TERM=xterm vim
:set termcap
shows "t_xon="
map <C-S> :echo "abc"<CR>
works (after <C-S> one see "abc" string echo-ed)
fixes: #12674
closes: #14542
Signed-off-by: Anton Sharonov <anton.sharonov@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/term.txt b/runtime/doc/term.txt
index d958229..1256d75 100644
--- a/runtime/doc/term.txt
+++ b/runtime/doc/term.txt
@@ -1,4 +1,4 @@
-*term.txt* For Vim version 9.1. Last change: 2024 Feb 28
+*term.txt* For Vim version 9.1. Last change: 2024 Apr 14
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -382,7 +382,7 @@
the last two characters of the option name. Only one termcap code is
required: Cursor motion, 't_cm'.
-The options 't_da', 't_db', 't_ms', 't_xs', 't_xn' represent flags in the
+The options 't_da', 't_db', 't_ms', 't_xs', 't_xn', 't_xo' represent flags in the
termcap. When the termcap flag is present, the option will be set to "y".
But any non-empty string means that the flag is set. An empty string means
that the flag is not set. 't_CS' works like this too, but it isn't a termcap
@@ -441,6 +441,11 @@
*t_xn* *'t_xn'*
t_xn if non-empty, writing a character at the last screen cell
does not cause scrolling
+ *t_xo* *'t_xo'*
+ t_xo if non-empty, terminal uses xon/xoff handshaking, mapping
+ CTRL-S will not be possible then, since it is used for flow
+ control (used by vt420 terminal). Setting this flag has only
+ an effect when starting Vim.
t_ZH italics mode *t_ZH* *'t_ZH'*
t_ZR italics end *t_ZR* *'t_ZR'*