# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2019-11-17 07:50:21
# Node ID f9068413bd0ca73c5b619a2dd82e28e1120db2d7
# Parent  3fd6ec54704c9965b52652af7d2d79c7d7062e8e

changectx: use unfiltered changelog to access parents of unfiltered revs

If a revision is not filtered, we know that its parents are not either. So we
can take a shortcut. This shortcut avoid the computation of all filtered revs in
some cases.

Differential Revision: https://phab.mercurial-scm.org/D7487

diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -523,7 +523,12 @@ class changectx(basectx):
     @propertycache
     def _parents(self):
         repo = self._repo
-        p1, p2 = repo.changelog.parentrevs(self._rev)
+        if self._maybe_filtered:
+            cl = repo.changelog
+        else:
+            cl = repo.unfiltered().changelog
+
+        p1, p2 = cl.parentrevs(self._rev)
         if p2 == nullrev:
             return [repo[p1]]
         return [repo[p1], repo[p2]]
diff --git a/tests/test-repo-filters-tiptoe.t b/tests/test-repo-filters-tiptoe.t
--- a/tests/test-repo-filters-tiptoe.t
+++ b/tests/test-repo-filters-tiptoe.t
@@ -58,7 +58,6 @@ Getting basic changeset inforation about
 Getting status of null
 
   $ hg status --change null
-  debug.filters: computing revision filter for "visible"
 
 Getting status of working copy