@Override
	public boolean isStartDragOk(List<GTreeNode> dragUserData, int dragAction) {
		return true;
	}
Verifies the given destination node can accept the given drop/copy/paste action and content
flavors.
@param destinationNode the node accepting the action
@param flavors the supported flavors of the action
@param dropAction the actual action see {@link DnDConstants}
@return true if valid
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/tree/DataTypeDragNDropHandler.java