patch 9.1.1738: cmdline-autocompletion breaks history navigation

Problem:  cmdline-autocompletion breaks history navigation (ddad431)
Solution: Support history navigation in cmdline autocompletion (Girish
          Palya)

Up/Down arrows support history navigation when using wildtrigger()

fixes: #18207
closes: #18219

Signed-off-by: Girish Palya <girishji@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/builtin.txt

@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2025 Sep 02
+*builtin.txt*	For Vim version 9.1.  Last change: 2025 Sep 06
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -12416,18 +12416,19 @@ wildtrigger()						*wildtrigger()*
 		produce a beep when no matches are found and generally
 		operates more quietly.  This makes it suitable for triggering
 		completion automatically, such as from an |:autocmd|.
+
 						*cmdline-autocompletion*
-		Example: To make the completion menu pop up automatically as
+		Example: To make the completion menu pop up automatically
-		you type on the command line, use: >
+		while typing on the command line: >
 			autocmd CmdlineChanged [:/\?] call wildtrigger()
 			set wildmode=noselect:lastused,full wildoptions=pum
 <
-		To retain normal history navigation (up/down keys): >
+		To retain normal history navigation with the up/down keys: >
-			cnoremap <Up>   <C-U><Up>
+			cnoremap <expr> <Up>   wildmenumode() ? "\<C-E>\<Up>"   : "\<Up>"
-			cnoremap <Down> <C-U><Down>
+			cnoremap <expr> <Down> wildmenumode() ? "\<C-E>\<Down>" : "\<Down>"
 <
-		To set an option specifically when performing a search, e.g.
+		To apply an option only during a search, for example to set
-		to set 'pumheight': >
+		'pumheight': >
 			autocmd CmdlineEnter [/\?] set pumheight=8
 			autocmd CmdlineLeave [/\?] set pumheight&
 <

src/ex_getln.c

@@ -1681,6 +1681,7 @@ getcmdline_int(
     int		wild_type = 0;
     int		event_cmdlineleavepre_triggered = FALSE;
     char_u	*prev_cmdbuff = NULL;
+    int		did_hist_navigate = FALSE;
 
     // one recursion level deeper
     ++depth;
@@ -1891,6 +1892,13 @@ getcmdline_int(
 	    c = safe_vgetc();
 	} while (c == K_IGNORE || c == K_NOP);
 
+	// Skip wildmenu during history navigation via Up/Down keys
+	if (c == K_WILD && did_hist_navigate)
+	{
+	    did_hist_navigate = FALSE;
+	    continue;
+	}
+
 	if (c == K_COMMAND || c == K_SCRIPT_COMMAND)
 	{
 	    int	    clen = ccline.cmdlen;
@@ -2489,7 +2497,10 @@ getcmdline_int(
 		    res = cmdline_browse_history(c, firstc, &lookfor, &lookforlen, histype,
 			    &hiscnt, &xpc);
 		    if (res == CMDLINE_CHANGED)
+		    {
+			did_hist_navigate = TRUE;
 			goto cmdline_changed;
+		    }
 		    else if (res == GOTO_NORMAL_MODE)
 			goto returncmd;
 		}

src/testdir/test_cmdline.vim

@@ -5039,4 +5039,28 @@ func Test_CmdlineLeave_vchar_keys()
   unlet g:leave_key
 endfunc
 
+" Skip wildmenu during history navigation via Up/Down keys
+func Test_skip_wildtrigger_hist_navigation()
+  call test_override("char_avail", 1)
+  cnoremap <F8> <C-R>=wildtrigger()[-1]<CR>
+  set wildmenu
+
+  call feedkeys(":ech\<F8>\<F4>\<C-B>\"\<CR>", "tx")
+  call assert_match('echo*', g:Sline)
+  call assert_equal('"echo', @:)
+
+  call feedkeys(":echom \"foo\"", "tx")
+  call feedkeys(":echom \"foobar\"", "tx")
+  call feedkeys(":ech\<F8>\<C-E>\<UP>\<C-B>\"\<CR>", "tx")
+  call assert_equal('"echom "foobar"', @:)
+  call feedkeys(":ech\<F8>\<C-E>\<UP>\<UP>\<UP>\<C-B>\"\<CR>", "tx")
+  call assert_equal('"echom "foo"', @:)
+  call feedkeys(":ech\<F8>\<C-E>\<UP>\<UP>\<UP>\<Down>\<C-B>\"\<CR>", "tx")
+  call assert_equal('"echom "foobar"', @:)
+
+  call test_override("char_avail", 0)
+  set wildmenu&
+  cunmap <F8>
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1738,
 /**/
     1737,
 /**/