Function drag_source

pub(crate) fn drag_source<P: Any + Send + Sync>(
    ui: &mut Ui,
    id: Id,
    payload: P,
    contents: impl FnOnce(&mut Ui),
) -> Response

An item that is clickable and right-clickable first and a drag-and-drop source second: the payload is only handed to egui once drag_intent holds, and the body is lifted under the cursor from that moment (the one thing Ui::dnd_drag_source is good for). Use this instead of dnd_drag_source, which senses drag only — grab cursor on hover, and a drag on any press.