JDK-8144872 : Remove ContextMenu.impl_showRelativeToWindow API
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Looking into this, the only place the 'hiddenProperties' set is used is in the Scene Builder MetadataIntrospector. Looking at the code it appears the algorithm introspects a bean, iterates through all of its properties, and populates a list of properties only when the propertyMetaData is null and the hiddenProperties set does not contain the property name. Therefore, it seems reasonable to update this patch and to remove the line mentioned in the comment above.
SceneBuilder seems to reference this property (through reflection, I would guess) :