filectx: use ctx.size comparisons to speed up ctx.cmp
Comparing sizes is cheaper than comparing file contents, as it does not
involve reading the file on disk or from the filelog.
It is however not always possible: some extensions, or encode filters,
change data when extracting it to the working directory.
[ original upstream description ]
Christian Ebert <blacktrash@gmx.net> [Tue, 12 Oct 2010 16:29:32 +0100] rev 838
Code cleanup
- move preselection of expansion candidates for rollback
and record into helper function
- same overwrite order in rollback and record:
1. modified, 2. added
- self.wlock() inside kwrepo class instead of repo.wlock()