renamedbetween: only return (file, node) pairs that exist in the original rev

mercurial/patch.py

@@ -469,6 +469,7 b' def diff(repo, node1=None, node2=None, f'
 
     def renamedbetween(f, n1, n2):
         r1, r2 = map(repo.changelog.rev, (n1, n2))
+        orig = f
         src = None
         while r2 > r1:
             cl = getchangelog(n2)
@@ -482,7 +483,13 b' def diff(repo, node1=None, node2=None, f'
                     f = src[0]
             n2 = repo.changelog.parents(n2)[0]
             r2 = repo.changelog.rev(n2)
-        return src
+        if orig == f:
+            return None
+        cl = getchangelog(n1)
+        m = getmanifest(cl[0])
+        if f not in m:
+            return None
+        return f, m[f]
 
     if node2:
         change = getchangelog(node2)

tests/test-git-export

@@ -73,3 +73,24 b' hg mv dst2 dst3'
 hg ci -m 'mv dst2 dst3; revert start' -d '0 0'
 
 hg diff --git -r 9:11
+
+echo a >> foo
+hg add foo
+hg ci -m 'add foo'
+echo b >> foo
+hg ci -m 'change foo'
+hg mv foo bar
+hg ci -m 'mv foo bar'
+echo c >> bar
+hg ci -m 'change bar'
+
+echo
+echo '% file created before r1 and renamed before r2'
+hg diff --git -r -3:-1
+echo
+echo '% file created in r1 and renamed before r2'
+hg diff --git -r -4:-1
+echo
+echo '% file created after r1 and renamed before r2'
+hg diff --git -r -5:-1
+

tests/test-git-export.out

@@ -70,3 +70,35 b' applying b.diff'
 diff --git a/dst2 b/dst3
 rename from dst2
 rename to dst3
+
+% file created before r1 and renamed before r2
+diff --git a/foo b/bar
+rename from foo
+rename to bar
+--- a/bar
++++ b/bar
+@@ -1,2 +1,3 @@ a
+ a
+ b
++c
+
+% file created in r1 and renamed before r2
+diff --git a/foo b/bar
+rename from foo
+rename to bar
+--- a/bar
++++ b/bar
+@@ -1,1 +1,3 @@ a
+ a
++b
++c
+
+% file created after r1 and renamed before r2
+diff --git a/bar b/bar
+new file mode 100644
+--- /dev/null
++++ b/bar
+@@ -0,0 +1,3 @@
++a
++b
++c