patch 9.2.0437: MS-Windows: cursor flicker in vtp mode
Commit:
https://github.com/vim/vim/commit/9d3019104c37bad56ff5bdc7614b26cb3fea7ce4
Author: Yasuhiro Matsumoto <[email protected]>
Date: Sun May 3 18:37:05 2026 +0000
patch 9.2.0437: MS-Windows: cursor flicker in vtp mode
Problem: MS-Windows: cursor flicker in vtp mode
Solution: Skip mch_update_cursor() in cursor_visible() when vtp is
active (Yasuhiro Matsumoto).
In vtp (ConPTY) mode the cursor visibility is controlled by DECTCEM
( [?25h / [?25l). The follow-up call to mch_update_cursor() then
re-emits DECSCUSR ( [0 q etc.) on every visibility toggle even though
the cursor shape did not change. Some terminals briefly redisplay the
cursor when DECSCUSR arrives, so this can cause a visible flash at the
position the cursor will be moved to next (e.g. column 0 ahead of a line
redraw).
In non-vtp mode the call is still required because SetConsoleCursorInfo()
inside mch_set_cursor_shape() reads s_cursor_visible to apply the
visibility change, so keep that path unchanged.
closes: #20122
Signed-off-by: Yasuhiro Matsumoto <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>
diff --git a/src/os_win32.c b/src/os_win32.c
index e8f8162f1..ab12d5a05 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -7104,9 +7104,19 @@ cursor_visible(BOOL fVisible)
s_cursor_visible = fVisible;
if (vtp_working)
+ {
+ // In vtp mode, visibility is controlled solely by DECTCEM. Skip
+ // mch_update_cursor() since shape is independent of visibility and
+ // re-emitting DECSCUSR can cause the terminal to briefly redisplay
+ // the cursor while a redraw is in progress.
vtp_printf(" [?25%c", fVisible ? 'h' : 'l');
+ return;
+ }
# ifdef MCH_CURSOR_SHAPE
+ // Non-vtp Windows console: SetConsoleCursorInfo() consults
+ // s_cursor_visible inside mch_set_cursor_shape(), so the call is needed
+ // to apply the new visibility.
mch_update_cursor();
# endif
}
diff --git a/src/version.c b/src/version.c
index f377ae58e..597842bf9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -729,6 +729,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 437,
/**/
436,
/**/
--
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