bundlerepo: disable filtering of changelog while constructing revision text

This avoids the following error that happened if base revision of bundle file
was hidden. bundlerevlog needs it to construct revision texts from bundle
content as revlog.revision() does.

  File "mercurial/context.py", line 485, in _changeset
    return self._repo.changelog.read(self.rev())
  File "mercurial/changelog.py", line 319, in read
    text = self.revision(node)
  File "mercurial/bundlerepo.py", line 124, in revision
    text = self.baserevision(iterrev)
  File "mercurial/bundlerepo.py", line 160, in baserevision
    return changelog.changelog.revision(self, nodeorrev)
  File "mercurial/revlog.py", line 1041, in revision
    node = self.node(rev)
  File "mercurial/changelog.py", line 211, in node
    raise error.FilteredIndexError(rev)
  mercurial.error.FilteredIndexError: 1

mercurial/bundlerepo.py

@@ -157,7 +157,15 class bundlechangelog(bundlerevlog, chan
         # Although changelog doesn't override 'revision' method, some extensions
         # may replace this class with another that does. Same story with
         # manifest and filelog classes.
-        return changelog.changelog.revision(self, nodeorrev)
+
+        # This bypasses filtering on changelog.node() and rev() because we need
+        # revision text of the bundle base even if it is hidden.
+        oldfilter = self.filteredrevs
+        try:
+            self.filteredrevs = ()
+            return changelog.changelog.revision(self, nodeorrev)
+        finally:
+            self.filteredrevs = oldfilter
 
 class bundlemanifest(bundlerevlog, manifest.manifest):
     def __init__(self, opener, bundle, linkmapper):

tests/test-obsolete.t

@@ -789,6 +789,62 Test that removing a local tag does not
   visible                            0:193e9254ce7e
   tip                                0:193e9254ce7e
 
+Test bundle overlay onto hidden revision
+
+  $ cd ..
+  $ hg init repo-bundleoverlay
+  $ cd repo-bundleoverlay
+  $ echo "A" > foo
+  $ hg ci -Am "A"
+  adding foo
+  $ echo "B" >> foo
+  $ hg ci -m "B"
+  $ hg up 0
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ echo "C" >> foo
+  $ hg ci -m "C"
+  created new head
+  $ hg log -G
+  @  2:c186d7714947 (draft) [tip ] C
+  |
+  | o  1:44526ebb0f98 (draft) [ ] B
+  |/
+  o  0:4b34ecfb0d56 (draft) [ ] A
+  
+
+  $ hg clone -r1 . ../other-bundleoverlay
+  adding changesets
+  adding manifests
+  adding file changes
+  added 2 changesets with 2 changes to 1 files
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ cd ../other-bundleoverlay
+  $ echo "B+" >> foo
+  $ hg ci --amend -m "B+"
+  $ hg log -G --hidden
+  @  3:b7d587542d40 (draft) [tip ] B+
+  |
+  | x  2:eb95e9297e18 (draft) [ ] temporary amend commit for 44526ebb0f98
+  | |
+  | x  1:44526ebb0f98 (draft) [ ] B
+  |/
+  o  0:4b34ecfb0d56 (draft) [ ] A
+  
+
+  $ hg incoming ../repo-bundleoverlay --bundle ../bundleoverlay.hg
+  comparing with ../repo-bundleoverlay
+  searching for changes
+  1:44526ebb0f98 (draft) [ ] B
+  2:c186d7714947 (draft) [tip ] C
+  $ hg log -G -R ../bundleoverlay.hg
+  o  4:c186d7714947 (draft) [tip ] C
+  |
+  | @  3:b7d587542d40 (draft) [ ] B+
+  |/
+  o  0:4b34ecfb0d56 (draft) [ ] A
+  
+
 #if serve
 
 Test issue 4506