Panic when a drag starts over an already hovered entity #21998
Description
Bevy version and features
Bevy main
What you did
Run one of these examples and try and drag something:
cargo run --example standard_widgets --features="experimental_bevy_ui_widgets"
cargo run --example ui_drag_and_drop
What went wrong
picking_events doesn't add a dragged over entity to the dragged_over map in PointerButtonState if the drag started with the dragged over entity already hovered . This causes a panic when the pointer is moved and picking_events tries to update the dragging_over state for the hovered entity.