[FE 1.0] Don't expand type enhancement

Actually shallow type enhancement is primary, it's more specific

^KT-50734 Fixed

compiler/testData/diagnostics/foreignAnnotationsTests/tests/kt50734.kt

@@ -0,0 +1,41 @@
+
+// FILE: Supplier.java
+import io.reactivex.rxjava3.annotations.NonNull;
+import io.reactivex.rxjava3.annotations.Nullable;
+
+// Shown from RxJava for reference
+@FunctionalInterface
+public interface Supplier<@NonNull T> {
+    T get() throws Throwable;
+}
+
+// FILE: Maybe.java
+public abstract class Maybe<T> {
+    public final void subscribe() {}
+}
+
+// FILE: FromSupplier.java
+import io.reactivex.rxjava3.annotations.NonNull;
+import io.reactivex.rxjava3.annotations.Nullable;
+
+public class FromSupplier {
+    static <@NonNull T> Maybe<T> fromSupplier3(Supplier<? extends @Nullable T> supplier) {
+        return null;
+    }
+    static <@NonNull T> Maybe<T> fromSupplier5(@NonNull Supplier<? extends @Nullable T> supplier) {
+        return null;
+    }
+}
+
+// FILE: main.kt
+fun main() {
+    // No Warning
+    // In this case, we have nullable type enhancement
+    FromSupplier.fromSupplier3<Boolean> { <!NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS!>null<!> }
+        .subscribe()
+
+    // In this case, we have not-null type enhancement
+    // Warning: Type Mismatch: Required Boolean? found Nothing
+    FromSupplier.fromSupplier5<Boolean> { <!NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS!>null<!> }
+        .subscribe()
+}