extract method from expression: declare necessary variables inside; reassign result when it was assigned before (IDEA-63593)

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

@@ -0,0 +1,11 @@
+class Foo {
+  void foo() {
+    int x = 0;
+    int y = x = newMethod();
+  }
+
+    private int newMethod() {
+        int x;
+        return x = 1;
+    }
+}