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If you create a node by extending AbstractNode and if you do not override the getActions method, the created node will contain the Properties action in its context menu by default, which will display an empty property sheet dialog. This is a regression because in previous releases the created node would not had any context menu. If this is an enhancement and not a bug please consider not displaying the Properties action if the node does not have any properties.
It used to be this way as long as I remember. Plain testing nodes always had disabled "Properties" action in their popups. Yardo, please correct me if I'm wrong.
My feeling is that PropertiesAction used to be there since 1997, at the beginning it used to be always enabled, later then it was disabled when there were no properties in the node, but this has been found a performance problem and as such it is now always enabled - e.g. exactly where it was in 1997.
OK, thank you for the clarification.