introduce parameter: ensure varargs are not substituted twice (IDEA-161779)

java/java-tests/testData/refactoring/introduceParameter/afterMethodCallRefToVararg.java

@@ -0,0 +1,17 @@
+class Test {
+
+    void f(String strings) {
+        final String[] strings1 = new String[]{"c", "d"};
+        final String foo = foo(strings1);
+        extract("a", "b", foo);
+    }
+
+    private static void extract(final String from, final String to, String anObject)  {
+
+    }
+
+    public String foo(String[] extensions) {
+      return null
+    }
+
+}

java/java-tests/testData/refactoring/introduceParameter/beforeMethodCallRefToVararg.java

@@ -0,0 +1,16 @@
+class Test {
+
+    void f(String strings) {
+      extract("a", "b", "c", "d");
+    }
+
+    private static void extract(final String from, final String to, final String... extensions)  {
+
+      <selection>foo(extensions)</selection>;
+    }
+
+    public String foo(String[] extensions) {
+      return null
+    }
+
+}