GimpSamplePointUndo
GimpSamplePointUndo;
GObject +----GimpObject +----GimpViewable +----GimpUndo +----GimpSamplePointUndo
GimpSamplePointUndo implements GimpConfigInterface.
"sample-point" GimpSamplePoint* : Read / Write / Construct Only
typedef struct _GimpSamplePointUndo GimpSamplePointUndo;
"sample-point"