switch_to_blog() does not handle permalinks

[wpmuguru]

MU Trac Ticket: ​http://trac.mu.wordpress.org/ticket/1168

When you run switch_to_blog() and then output any of the code that displays permalinks, the permalink structure remains that of the originating blog. If you switch to the main blog on a sub-directory install, links to posts/pages break, because the initial '/blog/' is left off the permalink. This patch adds permalinks, category base and tag base handling to the switch_to_blog and restore_current_blog functions.

Not tested in a subdomain install. If anyone could help out with testing, that'd be great. Thanks!

[wpmuguru]

In 3.0 we are flushing out the custom post_type support. What I would like to do here is write a plugin that does this using the switch_to_blog/restore_current_blog hooks and work out the bugs in the methodology in the plugin.

The second thing is that this adds a fair amount of processing. We won;t want to impose that on everyone.

[wpmuguru]

Closed duplicate #13530.

[wpmuguru]

Per discussion in IRC, this would be too CPU expensive to impose on all network installs. This can be done in a plugin via the switch_blog hook.