getEventsByTrigger
Collects every EventSchema in this subtree — this tile's own events first, then every descendant tile's — whose trigger equals eventTrigger. Used by EventManager.triggerEvents by way of TilesEventHolder.getEventsByTrigger, the mechanism behind screen-level triggers like onDisplay() reaching every matching event anywhere in the tree, not just top-level ones.
Return
every matching EventSchema in this subtree, own events before descendants'.
Parameters
eventTrigger
the trigger to match against.