Smart completion: sometimes we can insert comma after vararg argument too

idea/idea-completion/testData/handlers/smart/SecondVararg.kt.after

@@ -1,7 +1,7 @@
 fun foo(vararg v1: Int, vararg v2: Char, s: String) { }
 
 fun bar(c: Char) {
-    foo(*intArrayOf(), c<caret>)
+    foo(*intArrayOf(), c, <caret>)
 }
 
 // ELEMENT: c

idea/idea-completion/testData/handlers/smart/VarargWithParameterAfter.kt

@@ -0,0 +1,7 @@
+fun foo(vararg strings: String, p: String){ }
+
+fun bar(s: String){
+    foo(<caret>)
+}
+
+// ELEMENT: s

idea/idea-completion/testData/handlers/smart/VarargWithParameterAfter.kt.after

@@ -0,0 +1,7 @@
+fun foo(vararg strings: String, p: String){ }
+
+fun bar(s: String){
+    foo(s, <caret>)
+}
+
+// ELEMENT: s