Don't call trimChats when the box is minimized or maximized, instead call it
only when the minimized chats toggle appears or disappears, since that's the
element that adds/removes space.
Also, a fix. 'onShow' has been renamed to 'onMaximized'
Also fixed an issue w.r.t the plugin architecture. Previously infinite
recursion would happen when more than one plugin was overriding a method.
Resolved now by using a wrapper function that lazily sets the correct super
method.