Redirect loop with path_alias_xt

Issue Summary

The path_alias_xt module dynamically expands aliases such as 'project/myproject' for 'node/7' to also include aliases such as 'project/myproject/edit' for 'node/7/edit'. This causes a redirect loop with globalredirect, because the later module is overzealous in its redirection in some instances.

Without path_alias_xt, globalredirect will take a request for 'node/7/edit' and attempt to redirect again to 'node/7/edit'. Because the new path is the same as the old path, this behavior is innocuous. As soon as path_alias_xt is involved, though, the behavior becomes undesirable, because the request is now actually for 'project/myproject/edit'. Now, when globalredirect tries to go to 'node/7/edit', the paths are different, and to 'goto' will take effect. Unfortunately, the next time around, globalredirect will try to do the same exact thing again. This is because, although the current path did change to 'node/7/edit', the request is still for 'project/myproject/edit', so globalredirect will once again try to go to 'node/7/edit', even though that is already the current path.

The solution is to make the conditional around the redirection more rigorous, so that globalredirect will not attempt to redirect from the current path to the same current path. This additional condition does not interfere with the primary operation of globalredirect -- i.e., to redirect from 'node/7' to 'project/myproject' -- because in this case the current path does not match with the desired redirect destination.

Patches for Drupal 7 and Drupal 6 versions of globalredirect attached.