Dragging tab out of window doesn't work right when dragging left

[chinhster]

If you drag a tab out of its window to the right of the window, the tab is under the cursor as you drag as expected. However, if you drag a tab out of its window towards the left, the tab appears well left of the cursor instead of under it.

[chinhster]

The problem is that the _dragDetachedButton: method in MMTabDragAssistant.m uses the frame of the button that's being dragged AFTER it has been removed from its superview. What I did to fix it was in the _dragAttachedTabBarButton: method, I stored the origin of the button's frame at the beginning of the method before the button has been removed from its superview and passed that location to the _dragDetachedButton: method.