Port-dependent properties defined in onInit() are not working as expected.

[cwiede]

As an example, a filter might decide to define properties dependent on its dynamicInputPorts in onInit():

pc = self.propertyCollection()
ports = [p.name() for p in self.getDynamicOutputPorts()]
pc.defineProperty("prop", "default", options=dict(enum=["default"] + ports))

The code above will

• raise PropertyInconsistentDefinition
• only use the default value and ignore saved properties.