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diff --no-index: fix -R with file/directory conflicts - #2232

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HaokaiDing:fix/no-index-reverse-file-directory-mail
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HaokaiDing:fix/no-index-reverse-file-directory-mail

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CC: René Scharfe l.s.r@web.de, Jacob Keller jacob.e.keller@intel.com

When a path is a file on one side and a directory on the other,
queue_diff() queues the file separately before recursing into the
directory. This early queue entry bypasses the reverse_diff handling
used for ordinary files.

As a result, comparing directories d and e where d/sub is a file and
e/sub/file is another file reports both paths as deleted with -R.
Reversing the operands reports both paths as added instead.

Swap the filespecs of the early queue entry when reverse_diff is set,
so that -R reverses the file change as well as the directory contents.
Add regression tests for both directions.

Signed-off-by: Haokai Ding <hk_ding@outlook.com>
Copilot AI lite review requested due to automatic review settings September 17, 2026 21:26

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Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

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gitgitgadget Bot commented Sep 17, 2026

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@HaokaiDing

HaokaiDing commented Sep 17, 2026

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@dscho, could you enable GitGitGadget for this first submission with /allow HaokaiDing? I would like to preview and submit this patch to the Git mailing list.

The two new regression tests fail before the fix, and all 43 tests in t/t4053-diff-no-index.sh pass afterward on a local macOS build.

@dscho

dscho commented Sep 18, 2026

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/allow

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gitgitgadget Bot commented Sep 18, 2026

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User HaokaiDing is now allowed to use GitGitGadget.

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/preview

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gitgitgadget Bot commented Sep 18, 2026

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Preview email sent as pull.2232.git.1789715851144.gitgitgadget@gmail.com

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/submit

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gitgitgadget Bot commented Sep 18, 2026

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Submitted as pull.2232.git.1789715946888.gitgitgadget@gmail.com

To fetch this version into FETCH_HEAD:

git fetch https://github.com/gitgitgadget/git/ pr-2232/HaokaiDing/fix/no-index-reverse-file-directory-mail-v1

To fetch this version to local tag pr-2232/HaokaiDing/fix/no-index-reverse-file-directory-mail-v1:

git fetch --no-tags https://github.com/gitgitgadget/git/ tag pr-2232/HaokaiDing/fix/no-index-reverse-file-directory-mail-v1

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