controller script error due to ShowDurationRemaining Mixxx control

[JosepMaJAZ]

Bug Description

On Mixxx main, there is a problem at least with the Mixxx control ShowDurationRemaining as it is used in the Mapping for Numark Mixtrack Platinum.
https://manual.mixxx.org/2.3/en/mixxx-control.html#cap-[Controls]

The init of the mapping makes a connection to that control
// setup elapsed/remaining tracking
engine.makeConnection("[Controls]", "ShowDurationRemaining", MixtrackPlatinum.timeElapsedCallback);

If Mixxx is already started, the mapping can be used without issues.
If you restart Mixxx, you get the following error:

This control Object is currently created on the DlgPrefDeck constructor (Same for TimeFormat), so when the controller is initialized, the control hasn't yet been created. I am unsure where it should be created instead.

Version

2.4.0 alpha

OS

Windows 10

[ronso0]

No better place comes to mind.. we can't just create all COs possibly used in mappings in coreservices (or whereever).

Anyhow, should be fixed by #4651, no?

[ywwg]

I am also surprised this is not fixed by that change, strange.

[ywwg]

well er #4661 is the final version of that PR

[ywwg]

ah ok we went with a different approach that only created a specific set of menubar control objects. ShowDurationRemaining will have to be manually added to the list for it to show up properly

[JosepMaJAZ]

Copying here from zulip:
I believe the problem in this case is that the controls are created on the dialog itself, not on the settings. And we are talking about official, documented controls.
As such, these two need to be moved. Is the settings load/default a good candidate?

[ronso0]

Let's simply merge #4651 and this and similar issues are solved.
All that's missing is a manual test with Qt6/QML. How can do that?