Currently Glass DnD are:

#define com_sun_glass_ui_Clipboard_ACTION_NONE 0L
#define com_sun_glass_ui_Clipboard_ACTION_COPY 1L
#define com_sun_glass_ui_Clipboard_ACTION_MOVE 2L
#define com_sun_glass_ui_Clipboard_ACTION_REFERENCE 1073741824L
#define com_sun_glass_ui_Clipboard_ACTION_COPY_OR_MOVE 3L
#define com_sun_glass_ui_Clipboard_ACTION_ANY 1342177279L

and to me seem to imply that they should be used as single values, however, the impl seems to allow for masks - any combinations of them.

This combination is weird:

com_sun_glass_ui_Clipboard_ACTION_COPY | com_sun_glass_ui_Clipboard_ACTION_MOVE | com_sun_glass_ui_Clipboard_ACTION_COPY_OR_MOVE


And is:

com_sun_glass_ui_Clipboard_ACTION_COPY | com_sun_glass_ui_Clipboard_ACTION_MOVE | com_sun_glass_ui_Clipboard_ACTION_REFERENCE

any different than com_sun_glass_ui_Clipboard_ACTION_ANY ?

Supporting single values seems all we require (and if not we can add another flag) and would mean simper code.