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

idea/idea-completion/testData/smartMultiFile/StaticMembers1/Declarations1.kt

@@ -0,0 +1,9 @@
+package dependency1
+
+import test.C
+
+object O1 {
+    fun foo(): C = C()
+    fun bar(): C = C()
+    fun x(): String = ""
+}