vim-patch:9.1.1739: Matches may be listed twice with wildmode=longest,list

Problem:  Matches may be listed twice with wildmode=longest,list when
          "longest" doesn't change command line (after 9.1.1737).
Solution: Set did_wild_list when trying "list" after "longest"
          (zeertzjq).

closes: vim/vim#18227

vim/vim@a28a2eb

Author: zeertzjq

src/nvim/ex_getln.c

@@ -1195,6 +1195,9 @@ static int command_line_wildchar_complete(CommandLineState *s)
               nextwild(&s->xpc, WILD_NEXT, options, escape);
             }
             showmatches(&s->xpc, p_wmnu, wim_list_next, wim_noselect_next);
+            if (wim_list_next) {
+              s->did_wild_list = true;
+            }
           }
         }
       } else {

test/functional/ui/popupmenu_spec.lua

@@ -4517,7 +4517,7 @@ describe('builtin popupmenu', function()
 
         feed('<esc>')
 
-        -- Check "list" still works
+        -- Check that when "longest" produces no result, "list" works
         command('set wildmode=longest,list')
         feed(':cn<Tab>')
         screen:expect([[
@@ -4530,6 +4530,8 @@ describe('builtin popupmenu', function()
           cnfile       cnoremenu          |
           :cn^                             |
         ]])
+        feed('<Tab>')
+        screen:expect_unchanged()
         feed('s')
         screen:expect([[
                                           |

test/old/testdir/test_cmdline.vim

@@ -2900,6 +2900,8 @@ func Test_wildmenu_pum()
   call term_sendkeys(buf, "\<C-U>set wildmode=longest,list\<CR>")
   call term_sendkeys(buf, ":cn\<Tab>")
   call VerifyScreenDump(buf, 'Test_wildmenu_pum_30', {})
+  call term_sendkeys(buf, "\<Tab>")
+  call VerifyScreenDump(buf, 'Test_wildmenu_pum_30', {})
   call term_sendkeys(buf, "s")
   call VerifyScreenDump(buf, 'Test_wildmenu_pum_31', {})