Patch 8.2.4563
Problem:    "z=" in Visual mode may go beyond the end of the line.
Solution:   Adjust "badlen".
Files:      src/spellsuggest.c, src/testdir/test_spell.vim


*** ../vim-8.2.4562/src/spellsuggest.c  2022-02-16 19:24:03.630162410 +0000
--- src/spellsuggest.c  2022-03-13 20:10:41.055141499 +0000
***************
*** 506,511 ****
--- 506,515 ----
            curwin->w_cursor.col = VIsual.col;
        ++badlen;
        end_visual_mode();
+       // make sure we don't include the NUL at the end of the line
+       line = ml_get_curline();
+       if (badlen > STRLEN(line) - curwin->w_cursor.col)
+           badlen = STRLEN(line) - curwin->w_cursor.col;
      }
      // Find the start of the badly spelled word.
      else if (spell_move_to(curwin, FORWARD, TRUE, TRUE, NULL) == 0
*** ../vim-8.2.4562/src/testdir/test_spell.vim  2022-01-29 11:22:11.827641991 
+0000
--- src/testdir/test_spell.vim  2022-03-13 20:10:30.559188438 +0000
***************
*** 456,461 ****
--- 456,476 ----
    call assert_fails('set spellsuggest=timeout:--9', 'E474:')
  endfunc
  
+ func Test_spellsuggest_visual_end_of_line()
+   let enc_save = &encoding
+   set encoding=iso8859
+ 
+   " This was reading beyond the end of the line.
+   norm R00000000000
+   sil norm  0
+   sil! norm  i00000)
+   sil! norm  i00000)
+   call feedkeys("\<CR>")
+   norm z=
+ 
+   let &encoding = enc_save
+ endfunc
+ 
  func Test_spellinfo()
    new
    let runtime = substitute($VIMRUNTIME, '\\', '/', 'g')
*** ../vim-8.2.4562/src/version.c       2022-03-13 19:23:44.912318213 +0000
--- src/version.c       2022-03-13 20:12:06.214772795 +0000
***************
*** 752,753 ****
--- 752,755 ----
  {   /* Add new patch number below this line */
+ /**/
+     4563,
  /**/

-- 
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and beautiful; what's not to like?     --David A. Rogers

 /// Bram Moolenaar -- b...@moolenaar.net -- http://www.Moolenaar.net   \\\
///                                                                      \\\
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