vim-patch:9.1.1176: wrong indent when expanding multiple lines (#32746)

Problem:  wrong indentation of lastline when expanding multiple lines
Solution: Check OPENLINE_FORCE_INDENT flag in open_line() (glepnir)

closes: vim/vim#16786

34a7d82aae

Co-authored-by: glepnir <glephunter@gmail.com>

test/functional/ui/popupmenu_spec.lua

@@ -7310,6 +7310,7 @@ describe('builtin popupmenu', function()
             return [#{word: "func ()\n\t\nend", abbr: "function ()",}, #{word: "foobar"}, #{word: "你好\n\t\n我好"}]
           endfunc
           set omnifunc=Omni_test
+          inoremap <F5> <Cmd>call complete(col('.'), [ "my\n\tmulti\nline", "my\n\t\tmulti\nline" ])<CR>
         ]])
 
         feed('S<C-X><C-O>')
@@ -7452,6 +7453,21 @@ describe('builtin popupmenu', function()
           {1:~                               }|*14
           {2:-- INSERT --}                    |
         ]])
+
+        feed('<Esc>ggVGd')
+        command('filetype indent on')
+        command('setlocal noautoindent shiftwidth& tabstop&')
+        command('setlocal ft=lua')
+        feed('S<F5>')
+        screen:expect([[
+          {8:my}                              |
+          {8:        multi}                   |
+          {8:line}^                            |
+          {s:my^@  multi^@line   }{1:            }|
+          {n:my^@    multi^@line }{1:            }|
+          {1:~                               }|*14
+          {2:-- INSERT --}                    |
+        ]])
       end)
     end
   end