vim-patch:9.1.0956: completion may crash, completion highlight wrong with preview window

Problem:  completion may crash, completion highlight wrong with preview
          window (after v9.1.0954)
Solution: correctly calculate scroll offset, check for preview window
          when adding extra highlighting
          (glepnir)

when there have a preview window prepare_tagpreview
will change curwin to preview window and this may cause
ComplMatchIns check condition not correct. check wp is curwin
and also the type of wp is not a preview or poup info

fixes: https://github.com/vim/vim/issues/16284
closes: https://github.com/vim/vim/pull/16283

8d0bb6dc9f

test/functional/ui/popupmenu_spec.lua

@@ -5567,11 +5567,15 @@ describe('builtin popupmenu', function()
       -- oldtest: Test_pum_matchins_highlight()
       it('with ComplMatchIns highlight', function()
         exec([[
+          let g:change = 0
           func Omni_test(findstart, base)
             if a:findstart
               return col(".")
             endif
-            return [#{word: "foo"}, #{word: "bar"}, #{word: "你好"}]
+            if g:change == 0
+              return [#{word: "foo"}, #{word: "bar"}, #{word: "你好"}]
+            endif
+            return [#{word: "foo", info: "info"}, #{word: "bar"}, #{word: "你好"}]
           endfunc
           set omnifunc=Omni_test
           hi ComplMatchIns guifg=red
@@ -5663,6 +5667,21 @@ describe('builtin popupmenu', function()
           {2:-- INSERT --}                    |
         ]])
         feed('<Esc>')
+
+        feed(':let g:change=1<CR>S<C-X><C-O>')
+        screen:expect([[
+          info                            |
+          {1:~                               }|*2
+          {3:[Scratch] [Preview]             }|
+          {8:foo}^                             |
+          {s:foo            }{1:                 }|
+          {n:bar            }{1:                 }|
+          {n:你好           }{1:                 }|
+          {1:~                               }|*10
+          {4:[No Name] [+]                   }|
+          {2:-- }{5:match 1 of 3}                 |
+        ]])
+        feed('<Esc>')
       end)
 
       -- oldtest: Test_pum_matchins_highlight_combine()