Synthetic java properties are not always bold in completion and are not sorted as extensions

idea/idea-completion/testData/basic/java/boldOrGrayed/NonPredictableSmartCast2.kt

@@ -0,0 +1,12 @@
+import java.io.File
+
+class C : File("") {
+    val v: Int = 0
+}
+
+fun f(pair: Pair<out Any, out Any>) {
+    if (pair.first !is C) return
+    pair.first.<caret>
+}
+
+// EXIST: { lookupString: "absolutePath", itemText: "absolutePath", tailText: " (from getAbsolutePath())", typeText: "String!", attributes: "grayed" }