copies: expand `_chain` variable name to make the function easier to read
This came up while explaining what the function is about. I find the function
easier to follow that way.
--- a/mercurial/copies.py Wed Nov 13 20:45:34 2019 +0100
+++ b/mercurial/copies.py Wed Nov 13 20:42:08 2019 +0100
@@ -63,12 +63,12 @@
del t[k]
-def _chain(a, b):
- """chain two sets of copies 'a' and 'b'"""
- t = a.copy()
- for k, v in pycompat.iteritems(b):
- t[k] = a.get(v, v)
- return t
+def _chain(prefix, suffix):
+ """chain two sets of copies 'prefix' and 'suffix'"""
+ result = prefix.copy()
+ for key, value in pycompat.iteritems(suffix):
+ result[key] = prefix.get(value, value)
+ return result
def _tracefile(fctx, am, basemf):