Update viewport state after moving the stack (#1645)

* Update viewport state after moving the stack

* Only trigger new imagecallback if index bigger than 0

* Fix cornerstone viewport version

Co-authored-by: James Petts <jamesapetts@gmail.com>

extensions/cornerstone/package.json

@@ -51,6 +51,6 @@
     "classnames": "^2.2.6",
     "lodash.merge": "^4.6.2",
     "lodash.throttle": "^4.1.1",
-    "react-cornerstone-viewport": "^2.3.6"
+    "react-cornerstone-viewport": "2.3.8"
   }
 }