@Override
	protected Rectangle getDropLineRect( DropLocation loc ) {
		Rectangle r = super.getDropLineRect( loc );
		return isWideSelection() ? new Rectangle( 0, r.y, tree.getWidth(), r.height ) : r;
	}
Checks whether dropping on a row.
See DefaultTreeCellRenderer.getTreeCellRendererComponent().
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTreeUI.java