Patch 8.2.1770
Problem:    Invalid memory use when using SpellFileMissing autocmd.
Solution:   Add test case. (Dominique Pellé, closes #7036)  Fix using a window
            that was closed.
Files:      src/spell.c, src/testdir/test_spell.vim


*** ../vim-8.2.1769/src/spell.c 2020-09-16 17:30:23.789724893 +0200
--- src/spell.c 2020-09-28 23:11:02.259089664 +0200
***************
*** 2280,2290 ****
                }
            }
      }
  
  theend:
      vim_free(spl_copy);
      recursive = FALSE;
-     redraw_win_later(wp, NOT_VALID);
      return ret_msg;
  }
  
--- 2280,2290 ----
                }
            }
      }
+     redraw_win_later(wp, NOT_VALID);
  
  theend:
      vim_free(spl_copy);
      recursive = FALSE;
      return ret_msg;
  }
  
*** ../vim-8.2.1769/src/testdir/test_spell.vim  2020-09-27 13:58:33.342697775 
+0200
--- src/testdir/test_spell.vim  2020-09-28 22:57:07.449488501 +0200
***************
*** 120,125 ****
--- 120,148 ----
    set spell&
  endfunc
  
+ func Test_spell_file_missing()
+   let s:spell_file_missing = 0
+   augroup TestSpellFileMissing
+     autocmd! SpellFileMissing * let s:spell_file_missing += 1
+   augroup END
+ 
+   set spell spelllang=ab_cd
+   let messages = GetMessages()
+   call assert_equal('Warning: Cannot find word list "ab.utf-8.spl" or 
"ab.ascii.spl"', messages[-1])
+   call assert_equal(1, s:spell_file_missing)
+ 
+   new XTestSpellFileMissing
+   augroup TestSpellFileMissing
+     autocmd! SpellFileMissing * bwipe
+   augroup END
+   call assert_fails('set spell spelllang=ab_cd', 'E797:')
+ 
+   augroup! TestSpellFileMissing
+   unlet s:spell_file_missing
+   set spell& spelllang&
+   %bwipe!
+ endfunc
+ 
  func Test_spelllang_inv_region()
    set spell spelllang=en_xx
    let messages = GetMessages()
*** ../vim-8.2.1769/src/version.c       2020-09-28 22:29:25.425766287 +0200
--- src/version.c       2020-09-28 23:12:53.346755522 +0200
***************
*** 752,753 ****
--- 752,755 ----
  {   /* Add new patch number below this line */
+ /**/
+     1770,
  /**/

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