@Override
		public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation,
				int direction) {
			if (scrollableUnitIncrementOverride != -1) {
				return scrollableUnitIncrementOverride;
			}
			return super.getScrollableUnitIncrement(visibleRect, orientation, direction);
		}
Enable or disable using double-click to open and close tree nodes.  The default is true.
@param b true to enable
Ghidra/Framework/Docking/src/main/java/docking/widgets/tree/GTree.java