We only see the redeclaration
diagnostics on the declarations inside
the second file, because of
`FirRecorder::visitRegularClass`.
`data.state.classifierContainerFileMap`
references the last file, so
when checking the visibility of
the first `private class C { ... }`
(when collecting declarations that
conflict with the second `private class C`)
the provider returns the second file
instead of the first one, so the class
behaves as it is visible, and
`collectTopLevelConflict` returns in
this case.
As for why `INVISIBLE_*`s are reported
inside the first file: this is because
`data.state.classifierMap` stores the
last classifier it sees instead of
the first one.
^KT-62537
Nikolay Lunyak
a9ceae9667