Hi all, I've just committed revision 1200658, which introduces some fixes for UI plugins that attach to the target column. These plugins can basically find a target in either registered or unregistered mode, and without explicit checks, you cannot assume all targets are registered.
However, the fix is just a stop gap. A better fix would be to allow plugins to specifically register for a registered or unregistered target. This does mean that the number of tabs that you see will vary, which might confuse a user. WDYT? Greetings, Marcel
