From 4ed19fd336c4672989170992c3fe53cc74392476 Mon Sep 17 00:00:00 2001
From: Christian Brabandt <cb@256bit.org>
Date: Mon, 8 Sep 2025 15:05:13 -0400
Subject: [PATCH] patch 9.1.1741: Regression with kitty protocol and trailing
 byte "u"

Problem:  Regression with kitty protocol and trailing byte "u"
          (chdiza, after v9.1.1736)
Solution: Check that trailing byte "~" is present

fixes: #18232
closes: #18234

Signed-off-by: Christian Brabandt <cb@256bit.org>
---
 src/term.c                     | 20 +++++++++++---------
 src/testdir/test_termcodes.vim | 12 ++++++++++++
 src/version.c                  |  2 ++
 3 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/src/term.c b/src/term.c
index 2de1508f14..aec9559d0e 100644
--- a/src/term.c
+++ b/src/term.c
@@ -5338,7 +5338,8 @@ handle_key_with_modifier(
 	char_u	*buf,
 	int	bufsize,
 	int	*buflen,
-	int	iskitty)
+	int	iskitty,
+	int	trail)
 {
     // Only set seenModifyOtherKeys for the "{lead}27;" code to avoid setting
     // it for terminals using the kitty keyboard protocol.  Xterm sends
@@ -5376,11 +5377,11 @@ handle_key_with_modifier(
     if (key == ESC)
 	key = K_ESC;
 
-    else if (arg[0] >= 11 && arg[0] <= 24)
+    else if (arg[0] >= 11 && arg[0] <= 24 && trail == '~')
 	key = parse_csi_f_keys(arg[0]);
 
-    return put_key_modifiers_in_typebuf(key, modifiers,
-					csi_len, offset, buf, bufsize, buflen);
+    return put_key_modifiers_in_typebuf(key, modifiers, csi_len, offset, buf,
+	    bufsize, buflen);
 }
 
 /*
@@ -5396,7 +5397,8 @@ handle_key_without_modifier(
 	int	offset,
 	char_u	*buf,
 	int	bufsize,
-	int	*buflen)
+	int	*buflen,
+	int	trail)
 {
     char_u  string[MAX_KEY_CODE_LEN + 1];
     int	    new_slen;
@@ -5410,7 +5412,7 @@ handle_key_without_modifier(
 	string[2] = KE_ESC;
 	new_slen = 3;
     }
-    else if (arg[0] >= 11 && arg[0] <= 24)
+    else if (arg[0] >= 11 && arg[0] <= 24 && trail == '~')
     {
 	int key = parse_csi_f_keys(arg[0]);
 	string[0] = K_SPECIAL;
@@ -5724,7 +5726,7 @@ handle_csi(
     {
 	int iskitty = argc == 2 && (trail == 'u' || trail == '~');
 	return len + handle_key_with_modifier(arg, csi_len, offset, buf,
-		bufsize, buflen, iskitty);
+		bufsize, buflen, iskitty, trail);
     }
 
     // Key without modifier (Kitty sends this for Esc or F3):
@@ -5732,8 +5734,8 @@ handle_csi(
     //	{lead}{key}~
     else if (argc == 1 && (trail == 'u' || trail == '~'))
     {
-	return len + handle_key_without_modifier(arg,
-			    csi_len, offset, buf, bufsize, buflen);
+	return len + handle_key_without_modifier(arg, csi_len, offset, buf,
+		bufsize, buflen, trail);
     }
 
     // else: Unknown CSI sequence.  We could drop it, but then the
diff --git a/src/testdir/test_termcodes.vim b/src/testdir/test_termcodes.vim
index f37f618c81..6fb612e276 100644
--- a/src/testdir/test_termcodes.vim
+++ b/src/testdir/test_termcodes.vim
@@ -2542,6 +2542,18 @@ func Test_mapping_kitty_function_keys2()
   set timeoutlen&
 endfunc
 
+func Test_mapping_kitty_shift_enter()
+  new
+  set timeoutlen=10
+
+  imap <buffer> <S-CR> YYYY
+  call feedkeys(printf("i123 %s\<esc>", GetEscCodeCSIu("\<cr>", 2)),'Lx!')
+  call assert_equal('123 YYYY', getline(1))
+
+  bwipe!
+  set timeoutlen&
+endfunc
+
 func Test_insert_literal()
   set timeoutlen=10
 
diff --git a/src/version.c b/src/version.c
index 88906bd898..adf9f20611 100644
--- a/src/version.c
+++ b/src/version.c
@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1741,
 /**/
     1740,
 /**/