git 2.10.1 test regression in t3700-add.sh

[Jeremy Huddleston Sequoia <jeremyhu@freedesktop.org>]

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Hi Thomas,

I wanted to let you know that this patch of yours, which landed in git 2.10.1, introduced some test failures, seen on macOS.

Let me know if you need any additional information to track these down.

Thanks,
Jeremy

not ok 40 - git add --chmod=[+-]x changes index with already added file
#	
#		echo foo >foo3 &&
#		git add foo3 &&
#		git add --chmod=+x foo3 &&
#		test_mode_in_index 100755 foo3 &&
#		echo foo >xfoo3 &&
#		chmod 755 xfoo3 &&
#		git add xfoo3 &&
#		git add --chmod=-x xfoo3 &&
#		test_mode_in_index 100644 xfoo3
#	

commit 610d55af0f082f6b866dc858e144c03d8ed4424c
Author: Thomas Gummerer <t.gummerer@gmail.com>
Date:   Wed Sep 14 22:07:47 2016 +0100

    add: modify already added files when --chmod is given
    
    When the chmod option was added to git add, it was hooked up to the diff
    machinery, meaning that it only works when the version in the index
    differs from the version on disk.
    
    As the option was supposed to mirror the chmod option in update-index,
    which always changes the mode in the index, regardless of the status of
    the file, make sure the option behaves the same way in git add.
    
    Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
    Signed-off-by: Junio C Hamano <gitster@pobox.com>



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