--- a/mercurial/copies.py Fri Feb 27 23:30:42 2015 -0500
+++ b/mercurial/copies.py Fri Feb 27 13:57:37 2015 -0800
@@ -149,9 +149,7 @@
This is its own function so extensions can easily wrap this call to see what
files _forwardcopies is about to process.
"""
- missing = set(b.manifest().iterkeys())
- missing.difference_update(a.manifest().iterkeys())
- return missing
+ return b.manifest().filesnotin(a.manifest())
def _forwardcopies(a, b):
'''find {dst@b: src@a} copy mapping where a is an ancestor of b'''