This switches the change estimation logic used by break, rename
and copy detection from delta packing code to a more line
oriented one. This way, thee performance-density tradeoff by
delta packing code can be made without worrying about breaking
the rename detection.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This is to rework diffcore break/rename/copy detection code
so that it does not affected when deltifier code gets improved.
Signed-off-by: Junio C Hamano <junkio@cox.net>