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A longstanding confusing description of what --pickaxe option of git-diff does has been clarified in the documentation.
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"git-blame -S" did not quite work near the commits that were given on the command line correctly.
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"git diff --pickaxe-regexp" did not count overlapping matches correctly.
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"git diff" did not feed files in work-tree representation to external diff and textconv.
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"git-fetch" in a repository that was not cloned from anywhere said it cannot find origin, which was hard to understand for new people.
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"git-format-patch --numbered-files --stdout" did not have to die of incompatible options; it now simply ignores --numbered-files as no files are produced anyway.
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"git-ls-files --deleted" did not work well with GIT_DIR&GIT_WORK_TREE.
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"git-read-tree A B C…" without -m option has been broken for a long time.
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git-send-email ignored --in-reply-to when --no-thread was given.
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git-submodule add did not tolerate extra slashes and ./ in the path it accepted from the command line; it now is more lenient.
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git-svn misbehaved when the project contained a path that began with two dashes.
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import-zips script (in contrib) did not compute the common directory prefix correctly.
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miscompilation of negated enum constants by old gcc (2.9) affected the codepaths to spawn subprocesses.
Many small documentation updates are included as well.