filelog: allow censored files to contain padding data
To ensure delta compatibility, when a revision is censored, it is
padded to match the original data in size. The previous check does
not allow for padding because it was added before padding was found
to be a requirement.
For more background and design of the censorship feature, see:
mercurial.selenic.com/wiki/CensorPlan
% creating repo
% add and commit
C test.py
% change
M test.py