[vim/vim] patch 9.2.XXXX: heap-buffer-overflow in spell_suggest() (PR #21100)

Problem:  Heap-buffer-overflow in spell_suggest() when the cursor is
          beyond the end of the line, because a SpellFileMissing
          autocommand changed the buffer (dvaave2025).
Solution: parse_spelllang() may run autocommands, so validate the cursor
          position and re-take the saved position afterwards.

fixes: #21097

Supported by AI.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21100

-- Commit Summary --

  * patch 9.2.XXXX: heap-buffer-overflow in spell_suggest()

-- File Changes --

    M src/spellsuggest.c (3)
    M src/testdir/test_spell.vim (19)

-- Patch Links --

https://github.com/vim/vim/pull/21100.patch
https://github.com/vim/vim/pull/21100.diff

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