Fix performance regression for partial commits
When running "git commit paths" to create a partial commit, we used to carefully build the temporary index so that we do not lose the cached stat information. The rewrite of the command in C lost it by carelessly using read_tree(). This resurrects the earlier behaviour to keep the cached stat information as much as possible by using one-tree merge logic. Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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