gtk-clipboard-wait-for-rich-text (clipboard buffer)

clipboard -- a gtk-clipboard object
buffer -- a gtk-text-buffer object

data -- a newly allocated binary block of data which must be freed with the g-free function, or nil if retrieving the selection data failed.
format -- a gdk-atom as a string with the format of the returned data
length -- an integer with the length of the returned data

Requests the contents of the clipboard as rich text. This function waits for the data to be received using the main loop, so events, timeouts, etc, may be dispatched during the wait.