[vim/vim] Fix str2blob() ignoring UTF-16/UCS-2/UTF-32 encodings (PR #20466)

[mattn]

str2blob() routed every target encoding through convert_string(), which treats all Unicode encodings as utf-8, so the bytes were left unconverted. str2blob(['Hello'], {'encoding': 'utf-16le'}) returned 0z48656C6C6F instead of 0z480065006C006C006F00, breaking the round-trip with blob2str(). Add the same wide-encoding handling blob2str() uses.

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

  https://github.com/vim/vim/pull/20466

Commit Summary

• 70f26fc Fix str2blob() ignoring UTF-16/UCS-2/UTF-32 encodings

File Changes

(2 files)

• M src/strings.c (92)
• M src/testdir/test_functions.vim (12)

Patch Links:

• https://github.com/vim/vim/pull/20466.patch
• https://github.com/vim/vim/pull/20466.diff

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