format-patch: use default diff format even with patch options
Previously, running "git format-patch -U5" would cause the low-level diff machinery to change the diff output format from "not specified" to "patch". This meant that format-patch thought we explicitly specified a diff output format, and would not use the default format. The resulting message lacked both the diffstat and the summary, as well as the separating "---". Now format-patch explicitly checks for this condition and uses the default. That means that "git format-patch -p" will now have the "-p" ignored. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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