Infinite loop when getting rmq.view_controller from a tab bar screen using the more tab.

[markrickert]

See demo repository here: https://github.com/markrickert/rmq.view_controller

Steps to reproduce:

1. bundle
2. rake
3. Type into the REPL: rmq.view_controller.
4. Switch to a new tab and try again.
5. Switch to the "more" tab and try again. Notice it returns a UIMoreListController.
6. Tap into a view controller in the more tab and try again.
7. Crash.

Crashlog produces what looks like an infinite loop. Possible offending code here:

rmq/motion/ruby_motion_query/app.rb

Lines 121 to 144 in cd30cec

	def current_view_controller(root_view_controller = nil)
	if root_view_controller || ((window = RMQ.app.window) && (root_view_controller = window.rootViewController))
	case root_view_controller
	when UINavigationController
	current_view_controller(root_view_controller.visibleViewController)
	when UITabBarController
	current_view_controller(root_view_controller.selectedViewController)
	else
	if root_view_controller.respond_to?(:visibleViewController)
	current_view_controller(root_view_controller.visibleViewController)
	elsif root_view_controller.respond_to?(:topViewController)
	current_view_controller(root_view_controller.topViewController)
	elsif root_view_controller.respond_to?(:frontViewController)
	current_view_controller(root_view_controller.frontViewController)
	elsif root_view_controller.respond_to?(:center) && (center = root_view_controller.center) && center.is_a?(UIViewController)
	current_view_controller(root_view_controller.center)
	elsif root_view_controller.respond_to?(:childViewControllers) && root_view_controller.childViewControllers.count > 0
	current_view_controller(root_view_controller.childViewControllers.first)
	else
	root_view_controller
	end
	end
	end
	end

Note that it also crashes when you just type rmq into the REPL so it may be a more overarching problem.