Backport "(Re-)Drop inaccessible subclasses from refineUsingParent" to 3.3 LTS #112
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[Cherry-picked fb83893]
In tests/pos/i21790.scala, O.A has no class symbol, because it's an inaccessible private class of S. But in tests/warn/i21860.scala, Shape.Triangle doesn't have a "classSymbol" because it has multiple - Shape and Corners. So use .classSymbols.isEmpty instead of !.classSymbol.exists [Cherry-picked 21e5f3c]
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Backports scala#21930 to the 3.3.6.
PR submitted by the release tooling.
[skip ci]