[vim/vim] xxd: fix auto color detection for output file and TERM (PR #19813)

[h_east]

• Disable auto color when output goes to a file (two-argument form)
• Check TERM variable: disable color when unset, empty or "dumb"
• Add color_forced flag to preserve -R always behavior
• Add tests for the new behavior

fixes: #19790

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

  https://github.com/vim/vim/pull/19813

Commit Summary

• b228500 xxd: fix auto color detection for output file and TERM

File Changes

(2 files)

• M src/testdir/test_xxd.vim (64)
• M src/xxd/xxd.c (17)

Patch Links:

• https://github.com/vim/vim/pull/19813.patch
• https://github.com/vim/vim/pull/19813.diff

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[Christian Brabandt]

chrisbra left a comment (vim/vim#19813)

thanks, I'll also update the version header.

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[Christian Brabandt]

Closed #19813 via 1578ea9.

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