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patch 9.2.0110: No support for terminal synchronization mode
Problem: No support for terminal synchronization mode Solution: Add DEC 2026 support using the 'termsync' option (Foxe Chen). related: #11718 closes: #19541 Signed-off-by: Foxe Chen <chen.foxe@gmail.com> Signed-off-by: Christian Brabandt <cb@256bit.org>
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‎runtime/doc/options.txt‎

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*options.txt* For Vim version 9.2. Last change: 2026 Mar 02
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*options.txt* For Vim version 9.2. Last change: 2026 Mar 04
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VIM REFERENCE MANUAL by Bram Moolenaar
@@ -9096,6 +9096,24 @@ A jump table for the options with a short description can be found at |Q_op|.
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<
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NOTE: This option is reset when 'compatible' is set.
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*'termsync'* *'tsy'*
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'termsync' 'tsy' boolean (default off)
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global
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If the host terminal supports it, buffer all screen updates made
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during a redraw cycle so that each screen is displayed in the terminal
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all at once. This can prevent tearing or flickering when the terminal
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updates faster than Vim can redraw. If the host terminal does not
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support it or if Vim is running graphically, then this option does
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nothing.
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The specification can be found at:
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https://github.com/contour-terminal/vt-extensions/blob/master/synchronized-output.md
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Vim may set this option automatically at startup time when Vim is
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compiled with the |+termresponse| feature, by querying the terminal
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for DEC mode 2026 support. The terminal codes used are |t_BS| and
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|t_ES|.
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*'termwinkey'* *'twk'*
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'termwinkey' 'twk' string (default "")
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local to window

‎runtime/doc/quickref.txt‎

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*quickref.txt* For Vim version 9.2. Last change: 2026 Mar 02
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*quickref.txt* For Vim version 9.2. Last change: 2026 Mar 04
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VIM REFERENCE MANUAL by Bram Moolenaar
@@ -963,6 +963,7 @@ Short explanation of each option: *option-list*
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'termbidi' 'tbidi' terminal takes care of bi-directionality
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'termencoding' 'tenc' character encoding used by the terminal
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'termguicolors' 'tgc' use GUI colors for the terminal
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'termsync' 'tsy' enable terminal sync mode for redraw
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'termwinkey' 'twk' key that precedes a Vim command in a terminal
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'termwinscroll' 'twsl' max number of scrollback lines in a terminal window
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'termwinsize' 'tws' size of a terminal window

‎runtime/doc/tags‎

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@@ -1071,6 +1071,7 @@ $quote eval.txt /*$quote*
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't_AU' term.txt /*'t_AU'*
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't_BD' term.txt /*'t_BD'*
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't_BE' term.txt /*'t_BE'*
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't_BS' term.txt /*'t_BS'*
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't_CF' term.txt /*'t_CF'*
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't_CS' term.txt /*'t_CS'*
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't_CV' term.txt /*'t_CV'*
@@ -1081,6 +1082,7 @@ $quote eval.txt /*$quote*
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't_Ds' term.txt /*'t_Ds'*
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't_EC' term.txt /*'t_EC'*
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't_EI' term.txt /*'t_EI'*
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't_ES' term.txt /*'t_ES'*
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't_F1' term.txt /*'t_F1'*
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't_F2' term.txt /*'t_F2'*
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't_F3' term.txt /*'t_F3'*
@@ -1235,6 +1237,7 @@ $quote eval.txt /*$quote*
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'termbidi' options.txt /*'termbidi'*
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'termencoding' options.txt /*'termencoding'*
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'termguicolors' options.txt /*'termguicolors'*
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'termsync' options.txt /*'termsync'*
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'termwinkey' options.txt /*'termwinkey'*
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'termwinscroll' options.txt /*'termwinscroll'*
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'termwinsize' options.txt /*'termwinsize'*
@@ -1270,6 +1273,7 @@ $quote eval.txt /*$quote*
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'tsl' options.txt /*'tsl'*
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'tsr' options.txt /*'tsr'*
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'tsrfu' options.txt /*'tsrfu'*
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'tsy' options.txt /*'tsy'*
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'ttimeout' options.txt /*'ttimeout'*
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'ttimeoutlen' options.txt /*'ttimeoutlen'*
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'ttm' options.txt /*'ttm'*
@@ -10654,6 +10658,7 @@ t_AL term.txt /*t_AL*
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t_AU term.txt /*t_AU*
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t_BD term.txt /*t_BD*
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t_BE term.txt /*t_BE*
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t_BS term.txt /*t_BS*
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t_CF term.txt /*t_CF*
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t_CS term.txt /*t_CS*
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t_CTRL-W_. terminal.txt /*t_CTRL-W_.*
@@ -10673,6 +10678,7 @@ t_DL term.txt /*t_DL*
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t_Ds term.txt /*t_Ds*
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t_EC term.txt /*t_EC*
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t_EI term.txt /*t_EI*
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t_ES term.txt /*t_ES*
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t_F1 term.txt /*t_F1*
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t_F2 term.txt /*t_F2*
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t_F3 term.txt /*t_F3*

‎runtime/doc/term.txt‎

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*term.txt* For Vim version 9.2. Last change: 2026 Feb 14
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*term.txt* For Vim version 9.2. Last change: 2026 Mar 04
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VIM REFERENCE MANUAL by Bram Moolenaar
@@ -510,6 +510,10 @@ Added by Vim (there are no standard codes for these):
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|xterm-focus-event|
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t_fd disable focus-event tracking *t_fd* *'t_fd'*
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|xterm-focus-event|
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t_BS begin synchronized update *t_BS* *'t_BS'*
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see 'termsync'
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t_ES end synchronized update *t_ES* *'t_ES'*
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see 'termsync'
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Some codes have a start, middle and end part. The start and end are defined
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by the termcap option, the middle part is text.
@@ -528,6 +532,11 @@ t_SH must take one argument:
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t_RS is sent only if the response to t_RV has been received. It is not used
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on Mac OS when Terminal.app could be recognized from the termresponse.
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The t_BS and t_ES are not stored in the termcap, but are instead set to the
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following default values on startup:
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t_BS "\033[?2026h"
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t_ES "\033[?2026l"
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*mouse-reporting*
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Many terminals can report mouse clicks and some can report mouse movement and
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dragging. Vim needs to know what codes are being used for this.

‎runtime/doc/version9.txt‎

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@@ -52613,6 +52613,9 @@ Options: ~
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'statuslineopt' Extra options for the 'statusline', e.g. use the
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"maxheight" suboption to use several lines.
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't_BS' Begin synchronized update.
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't_ES' End synchronized update.
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'termsync' Enable support for terminal DEC 2026 sync mode.
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'winhighlight' Window-local highlight group mappings.
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==============================================================================

‎runtime/optwin.vim‎

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" These commands create the option window.
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"
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" Maintainer: The Vim Project <https://github.com/vim/vim>
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" Last Change: 2026 Mar 02
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" Last Change: 2026 Mar 04
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" Former Maintainer: Bram Moolenaar <Bram@vim.org>
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" If there already is an option window, jump to that one.
@@ -385,6 +385,8 @@ call <SID>AddOption("window", gettext("number of lines to scroll for CTRL-F and
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call append("$", " \tset window=" . &window)
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call <SID>AddOption("lazyredraw", gettext("don't redraw while executing macros"))
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call <SID>BinOptionG("lz", &lz)
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call <SID>AddOption("termsync", gettext("enable terminal sync mode"))
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call <SID>BinOptionG("tsy", &tsy)
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if has("reltime")
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call <SID>AddOption("redrawtime", gettext("timeout for 'hlsearch' and :match highlighting in msec"))
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call append("$", " \tset rdt=" . &rdt)

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