Function attach_display 

pub fn attach_display(handle: &impl HasDisplayHandle) -> bool

Attach the native clipboard to the runner’s Wayland display, so copies go through the connection that owns the focused surface — the compositor only accepts set_selection from that one.

Returns true when it attached. A no-op when the current host’s clipboard is not the system one (a host or test installed its own), when already attached, or when the display is not Wayland.