tests/test-context.py.out

context: generate filtered manifest efficiently for exact matchers

When the matcher is exact, there's no reason to iterate over the entire
manifest. It's much more efficient to iterate over the list of files instead.

For a repository with approximately 300,000 files, this speeds up
hg log -l10 --patch --follow for a frequently modified file from 16.5 seconds
to 10.5 seconds.

workingfilectx.date = (1000, 0)
ASCII   : Gr?ezi!
Latin-1 : Grüezi!
UTF-8   : Grüezi!
(['foo'], [], [], [], [], [], [])
diff --git a/foo b/foo

--- a/foo
+++ b/foo
@@ -1,1 +1,2 @@
 foo
+bar