--- a/mercurial/localrepo.py	Wed May 27 12:26:08 2020 +0200
+++ b/mercurial/localrepo.py	Wed May 27 12:45:39 2020 +0200
@@ -46,6 +46,7 @@
     match as matchmod,
     mergestate as mergestatemod,
     mergeutil,
+    metadata,
     namespaces,
     narrowspec,
     obsolete,
@@ -3145,51 +3146,8 @@
                 for f in drop:
                     del m[f]
                 if p2.rev() != nullrev:
-
-                    @util.cachefunc
-                    def mas():
-                        p1n = p1.node()
-                        p2n = p2.node()
-                        cahs = self.changelog.commonancestorsheads(p1n, p2n)
-                        if not cahs:
-                            cahs = [nullrev]
-                        return [self[r].manifest() for r in cahs]
-
-                    def deletionfromparent(f):
-                        # When a file is removed relative to p1 in a merge, this
-                        # function determines whether the absence is due to a
-                        # deletion from a parent, or whether the merge commit
-                        # itself deletes the file. We decide this by doing a
-                        # simplified three way merge of the manifest entry for
-                        # the file. There are two ways we decide the merge
-                        # itself didn't delete a file:
-                        # - neither parent (nor the merge) contain the file
-                        # - exactly one parent contains the file, and that
-                        #   parent has the same filelog entry as the merge
-                        #   ancestor (or all of them if there two). In other
-                        #   words, that parent left the file unchanged while the
-                        #   other one deleted it.
-                        # One way to think about this is that deleting a file is
-                        # similar to emptying it, so the list of changed files
-                        # should be similar either way. The computation
-                        # described above is not done directly in _filecommit
-                        # when creating the list of changed files, however
-                        # it does something very similar by comparing filelog
-                        # nodes.
-                        if f in m1:
-                            return f not in m2 and all(
-                                f in ma and ma.find(f) == m1.find(f)
-                                for ma in mas()
-                            )
-                        elif f in m2:
-                            return all(
-                                f in ma and ma.find(f) == m2.find(f)
-                                for ma in mas()
-                            )
-                        else:
-                            return True
-
-                    removed = [f for f in removed if not deletionfromparent(f)]
+                    rf = metadata.get_removal_filter(ctx, (p1, p2, m1, m2))
+                    removed = [f for f in removed if not rf(f)]
 
                 files = changed + removed
                 md = None