More StackLayout bugs?

unfortunately there seem to be more problems with StackLayout (it seems 
to me related to the previous post about StackLayout).

I want to see how a Color looks in front of a background. But the 
combination of View and StackLayout fails:

(
a=View().minSize_(40@40);
b=View().background_(Color.green).minSize_(40@40);
View().layout_(StackLayout(a,b).mode(\stackAll)).front;
a.background=Color(*{1.0.rand}!4);
a.background.postln;
)

^^ The preceding error dump is for ERROR: Primitive '_QWidget_SetLayout' 
failed.


the following compiles, but doesn't show the content of the Stackview 
(as if the size is not recognized)

(
a=View().minSize_(40@40);
b=View().background_(Color.green).minSize_(40@40);
View().layout_(HLayout(StackLayout(a,b).mode(\stackAll))).front;
a.background=Color(*{1.0.rand}!4);
a.background.postln;
)

file a bug on github?

should the recently reported bug also be put on github? separate or 
together?


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