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* Closes https://github.com/emilk/egui/issues/3882 This adds several methods to make drag-and-drop more ergonomic in egui. In particular, egui can now keep track of _what_ is being dragged for you (the _payload_). Low-level: * `egui::DragAndDrop` hold the payload during a drag Mid-level: * `Response::dnd_set_drag_payload` sets it for drag-sources * `Response::dnd_hover_payload` and `Response::dnd_release_payload` reads it for drop-targets High-level: * `ui.dnd_drag_source`: make a widget draggable * `ui.dnd_drop_zone`: a container where things can be dropped The drag-and-drop demo is now a lot simpler: https://github.com/emilk/egui/blob/emilk/drag-and-drop/crates/egui_demo_lib/src/demo/drag_and_drop.rs --------- Co-authored-by: Antoine Beyeler <abeyeler@ab-ware.com>