XR_ERROR_ACTIONSETS_ALREADY_ATTACHED

[RemiArnaud]

Thanks a lot for putting this together. Varjo just released 3.4 that includes the XR_HTCX_vive_tracker_interaction extension.

When testing the OpenXRViveTracker I have the following problem:

1. xrCreateActionSet is called in PostCreateInstance - at plugin initialization
2. xrAttachSessionActionSets is called by FOpenXRInput::Tick() as bActionsBound is false on the first Tick
3. xrSuggestInteractionProfileBindings is called in OnBeginSession
   this results in XR_ERROR_ACTIONSETS_ALREADY_ATTACHED error as per the specification:
   "If the action set for any action referenced in the suggestedBindings parameter has been included in a call to xrAttachSessionActionSets, the implementation must return XR_ERROR_ACTIONSETS_ALREADY_ATTACHED."

its a bummer that Tick() gets called before OnBeginSession, but the order of execution does not work as xrSuggestInteractionProfileBindings needs to be called before xrAttachSessionActionSets

[ROBYER1]

Is this related at all to the black screen bug I am getting with this issue once I set up a Vive tracker with OpenXR in SteamVR + Unity?
ValveSoftware/unity-xr-plugin#114

I have added an issue for it here as I have been chasing Steam Support and the SteamVR discussions forum which have both been dead ends