patch 9.1.1161: preinsert requires bot "menu" and "menuone" to be set

Problem:  preinsert requires bot "menu" and "menuone" to be set,
          but "menu" is redundant (after v9.1.1160)
Solution: preinsert only requires menuone (glepnir)

closes: #16763

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: glepnir

runtime/doc/options.txt

@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2025 Feb 28
+*options.txt*	For Vim version 9.1.  Last change: 2025 Mar 01
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2167,9 +2167,8 @@ A jump table for the options with a short description can be found at |Q_op|.
 	   preinsert
 		    Preinsert the portion of the first candidate word that is
 		    not part of the current completion leader and using the
-		    |hl-ComplMatchIns| highlight group. Does not work when
-		    "fuzzy" is set. Requires both "menu" and "menuone" to be
-		    set.
+		    |hl-ComplMatchIns| highlight group.  In order for it to
+		    work, "fuzzy" must not bet set and "menuone" must be set.
 
 	   preview  Show extra information about the currently selected
 		    completion in the preview window.  Only works in

src/insexpand.c

@@ -1985,15 +1985,15 @@ ins_compl_len(void)
 }
 
 /*
- * Return TRUE when preinsert is set AND both 'menu' and 'menuone' flags
- * are also set, otherwise return FALSE.
+ * Return TRUE when the 'completeopt' "preinsert" flag is in effect,
+ * otherwise return FALSE.
  */
     static int
 ins_compl_has_preinsert(void)
 {
     int cur_cot_flags = get_cot_flags();
-    return (cur_cot_flags & (COT_PREINSERT | COT_FUZZY | COT_MENU | COT_MENUONE))
-	== (COT_PREINSERT | COT_MENU | COT_MENUONE);
+    return (cur_cot_flags & (COT_PREINSERT | COT_FUZZY | COT_MENUONE))
+	== (COT_PREINSERT | COT_MENUONE);
 }
 
 /*

src/testdir/test_ins_complete.vim

@@ -3223,6 +3223,11 @@ function Test_completeopt_preinsert()
   call assert_equal("foo1bar", getline('.'))
   call assert_equal(7, col('.'))
 
+  set cot=preinsert,menuone
+  call feedkeys("Sfoo1 foo2\<CR>f\<C-X>\<C-N>", 'tx')
+  call assert_equal("foo1", getline('.'))
+  call assert_equal(1, col('.'))
+
   bw!
   set cot&
   set omnifunc&

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1161,
 /**/
     1160,
 /**/