Freed the mouse scroll event from the clutches of Manager
Freed the mouse scroll event from the clutches of Manager

  The manager was absorbing mouse scroll events even if it didn't
  contain a widget with an on_mouse_scroll event handler. The result of
  this is that if you have an active manager in a window, it will absorb
  mouse scroll events even if the mouse is not hovered over the manager.
  This is problematic if you have other things in the window that are
  bound to the on_mouse_scroll event.

jorgecarleitao/pyglet-gui