Java: Don't introduce parameter for potentially matching fields if the fields are written (IDEA-182284)

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

@@ -0,0 +1,24 @@
+import java.util.List;
+
+class C {
+    List<String> x;
+    List<String> y;
+
+    private void foo() {
+        <selection>
+        if (x.isEmpty()) return;
+        x.remove(0);
+        y.add(str());
+        baz();</selection>
+    }
+
+    private void bar() {
+        if (y.isEmpty()) return;
+        y.remove(0);
+        x.add(str());
+        baz();
+    }
+
+    private void baz() { }
+    private String str() { return null; }
+}