[PATCH 2 of 2] copies: clean up _related logic

[Gábor Stefanik]

# HG changeset patch
# User Gábor Stefanik <gabor.stefanik at nng.com>
# Date 1522848882 -7200
#      Wed Apr 04 15:34:42 2018 +0200
# Node ID 084ee003f2f3cb4d51129c4f1bb63e1ff4db14d0
# Parent  d72ca973100a1f1a4451a7d1efdc3e43ebc2912e
copies: clean up _related logic

The limit parameter was never actually used, since the only way the 4th case
could be reached was if f1r and f2r converged. The new code makes this clear,
and additionally reduces the conditional block to just 3 cases.

diff -r d72ca973100a -r 084ee003f2f3 mercurial/copies.py
--- a/mercurial/copies.py       Wed Apr 04 15:28:09 2018 +0200
+++ b/mercurial/copies.py       Wed Apr 04 15:34:42 2018 +0200
@@ -737,7 +737,7 @@
     except StopIteration:
         raise

-def _related(f1, f2, limit):
+def _related(f1, f2):
     """return True if f1 and f2 filectx have a common ancestor

     Walk back to common ancestor to see if the two files originate
@@ -764,10 +764,8 @@
                 f1, g1 = _loose_next(g1)
             elif f2r > f1r:
                 f1, g1 = _loose_next(g1)
-            elif f1 == f2:
-                return f1 # a match
-            elif f1r == f2r or f1r < limit or f2r < limit:
-                return False # copy no longer relevant
+            else: # f1 and f2 point to files in the same linkrev
+                return f1 == f2 # true if they point to the same file
     except StopIteration:
         return False

@@ -835,7 +833,7 @@
         c2 = getdstfctx(of, mdst[of])
         # c2 might be a plain new file on added on destination side that is
         # unrelated to the droids we are looking for.
-        cr = _related(oc, c2, tca.rev())
+        cr = _related(oc, c2)
         if cr and (of == f or of == c2.path()): # non-divergent
             if backwards:
                 data['copy'][of] = f
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