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patch 9.1.0321: Garbled output on serial terminals with XON/XOFF flow control

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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>
This commit is contained in:
Anton Sharonov
2024-04-14 20:02:24 +02:00
committed by Christian Brabandt
parent 4052474a1b
commit 49528da8a6
10 changed files with 60 additions and 6 deletions
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9
runtime/doc/term.txt
View File

@ -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 options are listed below. The associated termcap code is always equal to
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 @@ OUTPUT CODES *terminal-output-codes*
*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'*