copies: properly match result during changeset centric copy tracing

copies: properly match result during changeset centric copy tracing

By filtering "during" the iteration we were excluding rename information that
were not in the matched set but that file served as base information for the
matched set.

We now do all copy tracing matching at the end of the process to ensure we raise
proper result.

If we were aggregating information top down instead of bottom up we could do
filtering during processing. However, we don't.

Differential Revision: https://phab.mercurial-scm.org/D9585

--- a/mercurial/copies.py	Sun Dec 13 20:26:27 2020 +0100
+++ b/mercurial/copies.py	Sun Dec 13 20:16:34 2020 +0100
@@ -196,9 +196,7 @@
 
     changelogrevision = cl.changelogrevision
 
-    alwaysmatch = match.always()
-
-    if rustmod is not None and alwaysmatch:
+    if rustmod is not None:
 
         def revinfo(rev):
             p1, p2 = parents(rev)
@@ -356,7 +354,7 @@
 
     alwaysmatch = match.always()
 
-    if rustmod is not None and alwaysmatch:
+    if rustmod is not None:
         final_copies = rustmod.combine_changeset_copies(
             list(revs), children_count, targetrev, revinfo, isancestor
         )
@@ -396,12 +394,6 @@
                     elif parent == 2:
                         childcopies = changes.copied_from_p2
 
-                    if not alwaysmatch:
-                        childcopies = {
-                            dst: src
-                            for dst, src in childcopies.items()
-                            if match(dst)
-                        }
                     if childcopies:
                         newcopies = copies.copy()
                         for dest, source in pycompat.iteritems(childcopies):
@@ -447,6 +439,10 @@
         for dest, (tt, source) in all_copies[targetrev].items():
             if source is not None:
                 final_copies[dest] = source
+    if not alwaysmatch:
+        for filename in list(final_copies.keys()):
+            if not match(filename):
+                del final_copies[filename]
     return final_copies
 
 

--- a/tests/test-copies-chain-merge.t	Sun Dec 13 20:26:27 2020 +0100
+++ b/tests/test-copies-chain-merge.t	Sun Dec 13 20:16:34 2020 +0100
@@ -872,6 +872,19 @@
 Test copy information chaining
 ==============================
 
+Check that matching only affect the destination and not intermediate path
+-------------------------------------------------------------------------
+
+The two status call should give the same value for f
+
+  $ hg status --copies --rev 'desc("i-0")' --rev 'desc("a-2")'
+  A f
+    a
+  R a
+  $ hg status --copies --rev 'desc("i-0")' --rev 'desc("a-2")' f
+  A f
+    a (no-changeset no-compatibility !)
+
 merging with unrelated change does not interfere with the renames
 ---------------------------------------------------------------