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/src/testdir/test_terminal3.vim b/src/testdir/test_terminal3.vim
index 96a9e63..223bcc5 100644
--- a/src/testdir/test_terminal3.vim
+++ b/src/testdir/test_terminal3.vim
@@ -931,5 +931,25 @@
delfunc s:term_start_error
endfunc
+func Test_terminal_vt420()
+ CheckRunVimInTerminal
+ " For Termcap
+ CheckUnix
+ let rows=15
+ call writefile([':set term=vt420'], 'Xterm420', 'D')
+
+ let buf = RunVimInTerminal('-S Xterm420', #{rows: rows})
+ call TermWait(buf, 100)
+ call term_sendkeys(buf, ":set t_xo?\<CR>")
+ call WaitForAssert({-> assert_match('t_xo=y', term_getline(buf, rows))})
+ call StopVimInTerminal(buf)
+
+ call writefile([''], 'Xterm420')
+ let buf = RunVimInTerminal('-S Xterm420', #{rows: rows})
+ call TermWait(buf, 100)
+ call term_sendkeys(buf, ":set t_xo?\<CR>")
+ call WaitForAssert({-> assert_match('t_xo=\s\+', term_getline(buf, rows))})
+ call StopVimInTerminal(buf)
+endfunc
" vim: shiftwidth=2 sts=2 expandtab