[vim/vim] patch 9.0.$version: buf_copy_options() can lose the P_INSECURE flag (PR #20861)

Problem:  An insecurely-set 'indentexpr', 'formatexpr', 'includeexpr'
          or 'complete' value can end up evaluated outside the
          sandbox after buf_copy_options() and clears the flag.
Solution: Copy the insecure flag alongside the value in
          buf_copy_options(), and make 'complete' a per-buffer
          insecure-flags field

Supported by AI.

closes: #PR
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20861

-- Commit Summary --

  * patch 9.0.$version: buf_copy_options() can lose the P_INSECURE flag

-- File Changes --

    M src/option.c (10)
    M src/structs.h (1)
    M src/testdir/test_options.vim (118)

-- Patch Links --

https://github.com/vim/vim/pull/20861.patch
https://github.com/vim/vim/pull/20861.diff

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