Quickly Deleting filters from pipeline will cause crashes. Dragging by the "delete" icon on filter widgets will cause crashes

[imikejackson]

The user attempts to drag a filter via the delete button causes unexpected behaviors where the first filter will always be the filter that is dragged. The filter is then sort of deleted but never removed from the Pipeline view. This makes it impossible to actually delete the filter.

Quickly clicking on the delete button in multiple filters will also eventually cause a crash.

The animation may be the deep rooted cause of the crashes as the animation is done on the event queue and the preflight is probably running before the animation is complete. This causes an inconsistent state in the pipeline model which will lead to a crash.