KT-6028 Smart completion items priority

#KT-6028 Fixed

idea/testData/completion/weighers/smart/SmartPriority.kt

@@ -0,0 +1,22 @@
+var nonNullable: C = C()
+
+class C {
+    var nullableX: C? = null
+    var nullableFoo: C? = null
+
+    fun foo(pFoo: C, s: String) {
+        val local = C()
+        foo(<caret>)
+    }
+}
+
+// ORDER: "pFoo, s"
+// ORDER: pFoo
+// ORDER: nullableFoo
+// ORDER: nullableFoo
+// ORDER: this
+// ORDER: local
+// ORDER: nonNullable
+// ORDER: nullableX
+// ORDER: nullableX
+// ORDER: C

idea/testData/completion/weighers/smart/SmartPriority2.kt

@@ -0,0 +1,28 @@
+var nonNullable: C = C()
+var nullableX: C? = null
+var nullableFoo: C? = null
+
+abstract class C {
+    class object {
+        val INSTANCE_X = C()
+        val INSTANCE_FOO = C()
+    }
+}
+
+fun foo(pFoo: C, s: String) {
+    val local = C()
+    foo(<caret>)
+}
+
+
+// ORDER: "pFoo, s"
+// ORDER: pFoo
+// ORDER: nullableFoo
+// ORDER: nullableFoo
+// ORDER: C.INSTANCE_FOO
+// ORDER: local
+// ORDER: nonNullable
+// ORDER: nullableX
+// ORDER: nullableX
+// ORDER: C.INSTANCE_X
+// ORDER: object