DlangUI: how to change AppFrames?

[Ki Rill]

On Tuesday, 24 October 2023 at 11:23:05 UTC, GrimMaple wrote:
> I think there was some kind of issue when changing widgets like 
> that. Please try doing this instead:
> ```d
> window.executeInUiThread(() => window.mainWidget = 
> myPreviousFrame);
> ```
>
> Also, please post whole code so maybe I can fix this later

It does not work. It does accept new widgets though, but crashes 
if I try to change to the previous one.

I posted the whole code to GitHub 
[issue](https://github.com/buggins/dlangui/issues/677).