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390e90bba4
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: vim/vim#20963
closes: vim/vim#20964
Supported by AI.
e2dcefa0d8
Co-authored-by: Christian Brabandt <cb@256bit.org>