Static members completion works in smart completion + fixed incorrect finding of java method descriptor that caused duplicated items

idea/idea-completion/testData/smartMultiFile/StaticMembers2/JavaClass1.java

@@ -0,0 +1,15 @@
+import test.C
+
+public class JavaClass1 {
+    public static C f() {
+        return new C();
+    }
+
+    public static C g() {
+        return new C();
+    }
+
+    public static int h() {
+        return 0;
+    }
+}