Function bevy_mod_picking::mesh_events_system

pub fn mesh_events_system(
    state: Res<'_, RayCastPluginState>, 
    picking_events: EventWriter<'_, PickingEvent>, 
    hover_query: Query<'_, (Entity, &Hover, ChangeTrackers<Hover>), (Changed<Hover>, With<PickableMesh>)>, 
    selection_query: Query<'_, (Entity, &Selection, ChangeTrackers<Selection>), (Changed<Selection>, With<PickableMesh>)>
)

Looks for changes in selection or hover state, and sends the appropriate events