Java: Recognize multiple parametrized duplicates when extracting a method (IDEA-188243)

java/java-tests/testData/refactoring/extractMethod/ParametrizedDuplicateFoldArrayElement.java

@@ -0,0 +1,17 @@
+class DeclaredOutputVariable {
+    void foo(String[] a, int j) {
+        <selection>
+        String s = a[j];
+        if (s == null) return;
+        System.out.println(s.charAt(1) + "X");
+        </selection>
+        System.out.println(s.length());
+    }
+
+    void bar(String[] a, int k) {
+        String s = a[k];
+        if (s == null) return;
+        System.out.println(s.charAt(2) + "Y");
+        System.out.println(s.length());
+    }
+}