# HG changeset patch
# User Kyle Lippincott <spectral@google.com>
# Date 2018-08-23 07:34:25
# Node ID 8798be5f04fc38811f4adc0d592cc95ca1ab25fe
# Parent  079d7bfa463da5704412ad90a48a9211688f4854

treemanifest: avoid unnecessary copies/processing when using alwaysmatcher

Differential Revision: https://phab.mercurial-scm.org/D4368

diff --git a/mercurial/manifest.py b/mercurial/manifest.py
--- a/mercurial/manifest.py
+++ b/mercurial/manifest.py
@@ -940,7 +940,7 @@ class treemanifest(object):
 
     def filesnotin(self, m2, match=None):
         '''Set of files in this manifest that are not in the other'''
-        if match:
+        if match and not match.always():
             m1 = self.matches(match)
             m2 = m2.matches(match)
             return m1.filesnotin(m2)
@@ -1085,7 +1085,7 @@ class treemanifest(object):
         the nodeid will be None and the flags will be the empty
         string.
         '''
-        if match:
+        if match and not match.always():
             m1 = self.matches(match)
             m2 = m2.matches(match)
             return m1.diff(m2, clean=clean)