The change to make person/team fmt:links point to the mainsite has broken team unsubscription. This is quite a separate issue from bug #415166, although the same change triggered both.
The JavaScript works out the API URL to unsubscribe by looking at the href of the link in the subscriber's portlet. This was previously something like "/~someperson", but is now "https://launchpad.net/~someperson".
This causes a couple of obvious problems:
- Subscriber.initializer in subscriber.js trims off the first two characters to get the username. That doesn't work any more.
- unsubscribe_user_via_icon in bugtask-index.js assumes that giving LP.client.get_absolute_uri the href URL will return a path including the API root (eg. "/api/beta/~someperson"). But get_absolute_uri explicitly avoids adding the root to URLs with domains, so it now just returns "/~someperson".
A related problem is that inline subscriptions are inserted into the subscribers portlet with a href of just "/~someperson". I suspect that fixing that will be required to fix this.
I've attached a diff resulting from my poking around. It seems to solve all the problems, but with an utterly awful and useless hack.
Fixed in devel r9154.