merge: fix a copy detection bug (issue672)
When merging rev1 and rev2, we want to search for copies that happened
in rev1 but not in rev2 and vice-versa. We were starting the search at
rev1/rev2 and then going back, stopping as soon as we reached the revno
of the ancestor, but that can miss some cases (see the new
test-issue672).
Now we calculate the revisions that are ancestors of rev1 or rev2 (but
not both) and make sure the search doesn't stop too early.
Simplified test provided by mpm, based on a test case provided by
Edward Lee.
adding a
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# HG changeset patch
# User test
# Date 1 0
# Node ID 8580ff50825a50c8f716709acdf8de0deddcd6ab
# Parent 0000000000000000000000000000000000000000
a
diff -r 000000000000 -r 8580ff50825a a
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+++ b/a Thu Jan 01 00:00:01 1970 +0000
@@ -0,0 +1,1 @@
+a
adding b
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Date: Thu, 01 Jan 1970 00:02:01 +0000
From: quux
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# HG changeset patch
# User test
# Date 1 0
# Node ID 8580ff50825a50c8f716709acdf8de0deddcd6ab
# Parent 0000000000000000000000000000000000000000
a
diff -r 000000000000 -r 8580ff50825a a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/a Thu Jan 01 00:00:01 1970 +0000
@@ -0,0 +1,1 @@
+a
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Date: Thu, 01 Jan 1970 00:02:02 +0000
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# HG changeset patch
# User test
# Date 2 0
# Node ID 97d72e5f12c7e84f85064aa72e5a297142c36ed9
# Parent 8580ff50825a50c8f716709acdf8de0deddcd6ab
b
diff -r 8580ff50825a -r 97d72e5f12c7 b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/b Thu Jan 01 00:00:02 1970 +0000
@@ -0,0 +1,1 @@
+b
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