message: Ensure that a mouseout is fired with masked containers
diff: @@ -1041,7 +1041,9 @@ export default class InteractionManager extends EventEmitter
  }
  interactiveParent = false;
  }
  - // If there is a mask, no need to test against anything else if the pointer is not within the mask
  + // If there is a mask, no need to hitTest against anything else if the pointer is not within the mask.
  + // We still want to hitTestChildren, however, to ensure a mouseout can still be generated.
  + // https://github.com/pixijs/pixi.js/issues/5135
  else if (displayObject._mask)
  {
  if (hitTest)
  @@ -1049,7 +1051,6 @@ export default class InteractionManager extends EventEmitter
  if (!(displayObject._mask.containsPoint && displayObject._mask.containsPoint(point)))
  {
  hitTest = false;
  - hitTestChildren = false;
  }
  }
  }
  