Can't collapse or uncollapse Parameter SubGroup's programatically

[latenitefilms]

Apple Feedback Assistant ID: FB13500590

DESCRIBE THE BUG:
You can't use FxParameterSettingAPI_v6 to addFlags or removeFlags to programmatically collapse or uncollapse a Parameter SubGroup in FxPlug. In my case, I wanted to be able to right-click on a clip in the Viewer, and use FxOnScreenControl_v4's mouseUpAtPositionX method to trigger a flag change, so that I can collapse or uncollapse specific SubGroup's.

I've also tried using FxCustomParameterActionAPI_v4 before and after addFlags/removeFlags, but it has no impact.

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TO REPRODUCE:
Try and collapse or uncollapse a Parameter SubGroup using FxPlug.

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EXPECTED BEHAVIOUR:
You should be able to collapse or uncollapse SubGroup's programmatically.

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SCREENSHOTS:
None

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SPECS:

• 2021 16-inch MacBook Pro (M1 Max, 64GB RAM, 8TB SSD)
• macOS Sonoma 14.1.2
• Final Cut Pro 10.7.1

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ADDITIONAL COMMENTS:
None

[latenitefilms]

Interestingly, you can seem to do this via button, so the API is working, but maybe you can trigger it from an OSC?

@objc func pushButton() {
    let setParamAPI = _apiManager!.api(for: FxParameterSettingAPI_v5.self) as! FxParameterSettingAPI_v5
    setParamAPI.setParameterFlags(FxParameterFlags(kFxParameterFlag_COLLAPSED), toParameter: 2)
}

func addParameters() throws {
    let paramAPI = _apiManager!.api(for: FxParameterCreationAPI_v5.self) as! FxParameterCreationAPI_v5

    paramAPI.addFloatSlider(withName: "Brightness", parameterID: 1, defaultValue: 1.0, parameterMin: 0.0, parameterMax: 100.0, sliderMin: 0.0, sliderMax: 5.0, delta: 0.1, parameterFlags: FxParameterFlags(kFxParameterFlag_DEFAULT))

    paramAPI.startParameterSubGroup("Test SubGroup", parameterID: 2, parameterFlags: FxParameterFlags(kFxParameterFlag_DEFAULT))

    paramAPI.addPushButton(withName: "Change Name", parameterID: 3, selector: #selector(pushButton), parameterFlags: FxParameterFlags(kFxParameterFlag_DEFAULT))

    paramAPI.endParameterSubGroup()
}