metadataonlyctx: speed up sanity check
Previously the sanity check will construct manifestctx for both p1 and p2.
But it only needs the "manifest node" information, which could be read from
changelog directly.
--- a/mercurial/context.py Fri Feb 24 18:39:08 2017 +0100
+++ b/mercurial/context.py Sun Mar 26 12:26:35 2017 -0700
@@ -2054,10 +2054,10 @@
# sanity check to ensure that the reused manifest parents are
# manifests of our commit parents
mp1, mp2 = self.manifestctx().parents
- if p1 != nullid and p1.manifestctx().node() != mp1:
+ if p1 != nullid and p1.changeset()[0] != mp1:
raise RuntimeError('can\'t reuse the manifest: '
'its p1 doesn\'t match the new ctx p1')
- if p2 != nullid and p2.manifestctx().node() != mp2:
+ if p2 != nullid and p2.changeset()[0] != mp2:
raise RuntimeError('can\'t reuse the manifest: '
'its p2 doesn\'t match the new ctx p2')