Commit: patch 9.2.0206: MS-Window: stripping all CSI sequences

[Christian Brabandt]

patch 9.2.0206: MS-Window: stripping all CSI sequences

Commit: https://github.com/vim/vim/commit/f445ed0d56389d6f2ace5af9df73a3b8070e87a4
Author: Yasuhiro Matsumoto <matt...@gmail.com>
Date: Thu Mar 19 21:31:34 2026 +0000

patch 9.2.0206: MS-Window: stripping all CSI sequences

Problem: MS-Window: stripping all CSI sequences
(Ke Mao, after v9.2.0184)
Solution: Restore vtp_printf() to pass-through DECSUSR codes
(Yasuhiro Matsumoto).

Patch 9.2.0184 discards all CSI sequences in mch_write() when VTP is
active to prevent unwanted DECRQM responses. However, this also
removed the existing DECSCUSR pass-through, breaking cursor shape
changes (t_SI/t_SR/t_EI) on Windows Terminal.

Restore vtp_printf() pass-through for DECSCUSR (final byte 'q') while
continuing to discard other CSI sequences.

related: #19694
related: #11532
fixes: #19750
closes: #19755

Signed-off-by: Yasuhiro Matsumoto <matt...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/os_win32.c b/src/os_win32.c
index 62fe2ffb7..0174068f0 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -7443,7 +7443,9 @@ notsgr:
// When USE_VTP is active, CSI sequences written through
// write_chars() are interpreted by the console's VTP parser,
// generating responses (e.g. DECRQM) that end up in the
- // input buffer as unwanted keystrokes. Discard them.
+ // input buffer as unwanted keystrokes. Parse the sequence
+ // and only pass through known safe ones (e.g. DECSCUSR for
+ // cursor shape), discard the rest.
if (USE_VTP)
{
int l = 2;
@@ -7453,7 +7455,12 @@ notsgr:
l++;
// skip the final byte (0x40-0x7E)
if (s + l < end && s[l] >= 0x40 && s[l] <= 0x7E)
+ {
+ // DECSCUSR (cursor style): pass through to terminal
+ if (s[l] == 'q')
+ vtp_printf("%.*s", l + 1, s);
l++;
+ }
len -= l - 1;
s += l;
}
diff --git a/src/version.c b/src/version.c
index 439cfd26b..6914a9b5d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 206,
/**/
205,
/**/