static SHARED_CLIPBOARD: OnceLock<Option<Mutex<Clipboard>>>Expand description
A shared clipboard for use by the [DefaultClipboardDelegate]. This is protected by
a mutex so that it can only be used by one thread at a time. The arboard documentation
suggests that more than one thread shouldn’t try to access the Windows clipboard at a
time. See https://docs.rs/arboard/latest/arboard/struct.Clipboard.html.