Teach provablyDisjoint to handle FromJavaObject #15769
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SpaceEngine makes use of provablyDisjoint, using its Empty space as a result. In the test case the scrutinee is of type xs.E, which has info `>: Nothing <: <FromJavaObject>`, which isn't a subtype of Double and Double isn't a subtype of it either. But their intersection does exist, in boxed Double. The code here is exactly like FromJavaObject is handled in isSubType's "firstTry".
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SpaceEngine makes use of provablyDisjoint, using its Empty space as a
result. In the test case the scrutinee is of type xs.E, which has info
>: Nothing <: <FromJavaObject>, which isn't a subtype of Double andDouble isn't a subtype of it either. But their intersection does exist,
in boxed Double.
The code here is exactly like FromJavaObject is handled in isSubType's
"firstTry".
fixes #15717