Revision 1882326

Fix issue #4762 "authz doesn't combine global and repository rules"

The new authz implementation of SVN 1.10 introduced an incompatible
change in the interpretation of authz rules:

Global access rules can be configured for a particular user and a specific
path. Such global rules were ignored if a repository-specific rule is also
present for the same path, even if this repository-specific rule does not
apply to the user in question.

This change seems unnecessary because it broke backwards compatibility with
existing authz files, from SVN 1.9 and older, for no discernible benefit.
The change was probably not intentional as this situation was not covered
by the test suite before a test case was added in r1835049.

Restore the behaviour of SVN 1.9: It is now again possible to override
per-path access rules for specific users (and groups) at the global level.
Such global rules are overridden by repository-specific rules only if
both the user and the path match the repository-specific rule.

* subversion/libsvn_repos/authz.c
  (create_user_authz): Prefer rules which apply to both the user and
    the path over rules which apply only to the path. If both a global
    and a repository-specific rule apply to user and path then prefer
    the repository-specific one.

* subversion/tests/libsvn_repos/authz-test.c
  (reposful_reposless_stanzas_inherit): Remove XFAIL marker.