Temporarily revert r1759233 in preparation for a new 1.10.x alpha, waiting further on-list discussion.
Temporarily revert r1759233 in preparation for a new 1.10.x alpha, waiting
further on-list discussion.

This patch added the assumption that we could just compare the in-wc file
to its SHA1 to see if the file was changed. This has a few known drawbacks
which were discussed on list to which we found solutions (E.g. optimizing
a check on the first KByte), but none were implemented yet. Now we also
have the SHA1 attack which introduces new issues.

For safety I now revert this change, but I hope we can find a better way
to release some of the optimizations implemented in this patch in a future
release.

Note that some of the assumptions documented in r1759233 are not correct
as the pristine store provides smarter streams than assumed.

* subversion/libsvn_wc/questions.c
  Revert r1759233.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1801448 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion