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

idea/idea-completion/testData/basic/common/boldOrGrayed/ImmediateMembers2.kt

@@ -0,0 +1,25 @@
+trait T {
+    fun fromTrait(){}
+}
+
+abstract class Base : T {
+    fun fromBase(){}
+}
+
+class Derived : Base() {
+    override fun fromTrait() { }
+
+    fun fromDerived(){}
+}
+
+fun foo(o: Any) {
+    if (o is Derived) {
+        o.<caret>
+    }
+}
+
+// EXIST: { itemText: "fromTrait", attributes: "" }
+// EXIST: { itemText: "fromDerived", attributes: "bold" }
+// EXIST: { itemText: "fromBase", attributes: "" }
+// EXIST: { itemText: "hashCode", attributes: "" }
+// EXIST: { itemText: "equals", attributes: "" }