/// \returns true if the system clipboard has been set within LyX
/// (document contents, dialogs count as external here).
virtual bool isInternal() const = 0;
+ /// \returns true if the OS has the concept of clipboard ownership,
+ /// which is crucial for our concept of internal clipboard.
+ virtual bool hasInternal() const = 0;
/// Is the clipboard empty?
/// \returns true if both the LyX and the plaintext versions of the
/// clipboard are empty.