pub fn default_backend() -> Box<dyn ExternalDndBackend>Expand description
The default external-drag backend for the current target.
Every desktop target now has a real backend: OLE on Windows,
NSDraggingDestination on macOS, wl_data_device on Wayland, XDND on X11.
NoopExternalDndBackend remains for targets with no drop-target
implementation at all. TeksiloAppBuilder::install_external_dnd uses this.