patch 9.2.0508: completion: cannot complete user cmd :K with 'ignorecase'

Commit: 
https://github.com/vim/vim/commit/b54e57ee54f0a4e6eac74b071071a9d85326de3a
Author: Yasuhiro Matsumoto <[email protected]>
Date:   Thu May 21 19:57:06 2026 +0000

    patch 9.2.0508: completion: cannot complete user cmd :K with 'ignorecase'
    
    Problem:  completion: cannot complete user cmd :K with 'ignorecase'
              (rendcrx)
    Solution: Skip the short-circuit when 'ignorecase' is set
              (Yasuhiro Matsumoto)
    
    The set_cmd_index() short-circuit for the :k command treats ":k<X>" as
    ":k {X}" (mark argument), which makes ":kz<Tab>" never reach the
    command-name expansion path. With 'ignorecase' the same prefix on other
    letters (":gz<Tab>") completes a user command like :Gz, so the result is
    inconsistent. Skip the short-circuit when 'ignorecase' is set; default
    behaviour is preserved so the existing :k tests still pass.
    
    fixes:  #20241
    closes: #20275
    
    Co-authored-by: zeertzjq <[email protected]>
    Signed-off-by: Yasuhiro Matsumoto <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/src/cmdexpand.c b/src/cmdexpand.c
index 19ae31998..8d9c2d7b7 100644
--- a/src/cmdexpand.c
+++ b/src/cmdexpand.c
@@ -1759,11 +1759,12 @@ set_cmd_index(char_u *cmd, exarg_T *eap, expand_T *xp, 
int *complp)
     // Isolate the command and search for it in the command table.
     // Exceptions:
     // - the 'k' command can directly be followed by any character, but do
-    // accept "keepmarks", "keepalt" and "keepjumps". As fuzzy matching can
-    // find matches anywhere in the command name, do this only for command
-    // expansion based on regular expression and not for fuzzy matching.
+    // accept "keepmarks", "keepalt" and "keepjumps". Bypass also when
+    // 'ignorecase' is set so a lowercase ":kz" still completes a user
+    // command like :Kz (#20241), and for fuzzy matching as that can find
+    // matches anywhere in the command name.
     // - the 's' command can be followed directly by 'c', 'g', 'i', 'I' or 'r'
-    if (!fuzzy && (*cmd == 'k' && cmd[1] != 'e'))
+    if (!fuzzy && !p_ic && (*cmd == 'k' && cmd[1] != 'e'))
     {
        eap->cmdidx = CMD_k;
        p = cmd + 1;
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 7c1365b6a..31fb1f8ff 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -4095,6 +4095,27 @@ func Test_fuzzy_completion_cmd_k()
   set wildoptions&
 endfunc
 
+" Issue #20241: with 'ignorecase', a lowercase "k"-prefixed input should
+" still complete a user command starting with "K".
+func Test_cmdline_complete_user_cmd_k_with_ignorecase()
+  command! Kz echo "hello"
+  command! Gz echo "here"
+
+  set noignorecase
+  call assert_equal([], getcompletion('kz', 'cmdline'))
+  call assert_equal([], getcompletion('gz', 'cmdline'))
+  call assert_equal(['Kz'], getcompletion('Kz', 'cmdline'))
+  call assert_equal(['Gz'], getcompletion('Gz', 'cmdline'))
+
+  set ignorecase
+  call assert_equal(['Kz'], getcompletion('kz', 'cmdline'))
+  call assert_equal(['Gz'], getcompletion('gz', 'cmdline'))
+
+  set ignorecase&
+  delcommand Kz
+  delcommand Gz
+endfunc
+
 " Test for fuzzy completion for user defined custom completion function
 func Test_fuzzy_completion_custom_func()
   func Tcompl(a, c, p)
diff --git a/src/version.c b/src/version.c
index 863043dab..40b26d7cf 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 */
+/**/
+    508,
 /**/
     507,
 /**/

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