[vim/vim] patch 9.2.XXXX: crash when getcompletiontype() gets a NULL string (PR #20964)

Problem:  Crash when getcompletiontype()/getcompletion() gets a NULL string
          (dvaave2025).
Solution: Do not write the NUL terminator in set_cmd_context() when the
          cursor column is at or past the end of the string, since the
          string may be a read-only literal.

fixes:  #20963
closes: #PR

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

  https://github.com/vim/vim/pull/20964

-- Commit Summary --

  * patch 9.2.XXXX: crash when getcompletiontype() gets a NULL string

-- File Changes --

    M src/cmdexpand.c (14)
    M src/testdir/test_cmdline.vim (5)

-- Patch Links --

https://github.com/vim/vim/pull/20964.patch
https://github.com/vim/vim/pull/20964.diff

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