Setting KNOB_CHANGED_RECURSIVE on port number knob to work around nuke not calling DisplayIop::knob_changed() when the knob is changed from a PythonPanel.knobChanged() method.
Setting KNOB_CHANGED_RECURSIVE on port number knob to work around nuke not calling DisplayIop::knob_changed() when the knob is changed from a PythonPanel.knobChanged() method.

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