number after "-M" or "-C" option (e.g. "-M8" to tell it to use
8/10 = 80%).
-Note. When the "-C" option is used, git-diff-cache and
-git-diff-file commands feed not just modified filepairs but
-unmodified ones to diffcore mechanism as well. This lets the
-copy detector consider unmodified files as copy source
-candidates at the expense of making it slower. Currently
-git-diff-tree does not feed unmodified filepairs even when the
-"-C" option is used, so it can detect copies only if the file
-that was copied happened to have been modified in the same
-changeset.
+Note. When the "-C" option is used with --find-copies-harder
+option, git-diff-* commands feed unmodified filepairs to
+diffcore mechanism as well as modified ones. This lets the copy
+detector consider unmodified files as copy source candidates at
+the expense of making it slower. Without --find-copies-harder,
+git-diff-* commands can detect copies only if the file that was
+copied happened to have been modified in the same changeset.
diffcore-merge-broken
-B/60 (the same as above, since diffcore-break defautls to
50%).
+Note that earlier implementation left a broken pair as a separate
+creation and deletion patches. This was unnecessary hack and
+the latest implementation always merges all the broken pairs
+back into modifications, but the resulting patch output is
+formatted differently to still let the reviewing easier for such
+a complete rewrite by showing the entire contents of old version
+prefixed with '-', followed by the entire contents of new
+version prefixed with '+'.
+
diffcore-pickaxe
----------------