[PATCH v3 2/4] ui-patch.c: Use log_tree_commit() to generate diffs

[Jason A. Donenfeld]

http://git.zx2c4.com/cgit/patch/?id=wip&id2=master

This appears to work!


Apparently some tests need to be updated:

not ok 7 - generate patch for initial commit
#
#               cgit_query "url=foo/patch&id=$root" >tmp
#
not ok 8 - find `cgit` signature
#
#               tail -1 tmp | grep "^cgit"
#
# failed 2 among 8 test(s)