localrepo: reuse parent manifest in commitctx if no files have changed
This speeds up the in-memory version of debugbuilddag that I'm
working on considerably for the case where we want to build just
a 00changelog.i (for discovery tests, for instance).
There are a couple of test changes because node ids in tests
have changed.
The changes to the patch names in test-mq-qdelete.t were required
because they could collide with nodeid abbreviations and newly
actually do (patch "c" collides with id "cafe..." for patch "b").
[ original upstream description ]
536c1797202d57efb77bea098e10968ff01602ce universal_scheme
ba000e29ecf3b8df09e0fd363a78cabbe3c2a78f cvs_scheme
1fe48bf82d056f1ece05baccab888357c10c5ab8 r0.1
2e930f84224222ad6514a3c5dc6e00350e199e92 very_cvs
99dc49c5bcfba9d5b412c5fa6d0bf3ba20d68df1 hgkw_standalone_setup
15e8cd7f5295728b089fc8ba236c0f079572fb1d nohook
0c8b7e5c25a6b9a0d2782eaa3748eb546f5a254f archive
0000000000000000000000000000000000000000 universal_scheme
0000000000000000000000000000000000000000 cvs_scheme
0000000000000000000000000000000000000000 r0.1
0000000000000000000000000000000000000000 very_cvs
0000000000000000000000000000000000000000 hgkw_standalone_setup
0000000000000000000000000000000000000000 nohook
0000000000000000000000000000000000000000 archive