fix(feedback): Fixes the logic for the thank you dialog

conference.js

@@ -1748,8 +1748,11 @@ export default {
     hangup (requestFeedback = false) {
         APP.UI.hideRingOverLay();
         let requestFeedbackPromise = requestFeedback
-                ? APP.UI.requestFeedback().catch(() => Promise.resolve())
+                ? APP.UI.requestFeedbackOnHangup()
-                : Promise.resolve();
+                // false - because the thank you dialog shouldn't be displayed
+                    .catch(() => Promise.resolve(false))
+                : Promise.resolve(true);// true - because the thank you dialog
+                //should be displayed
         // All promises are returning Promise.resolve to make Promise.all to
         // be resolved when both Promises are finished. Otherwise Promise.all
         // will reject on first rejected Promise and we can redirect the page
@@ -1757,9 +1760,9 @@ export default {
         Promise.all([
             requestFeedbackPromise,
             room.leave().then(disconnect, disconnect)
-        ]).then(() => {
+        ]).then(values => {
             APP.API.notifyReadyToClose();
-            maybeRedirectToWelcomePage();
+            maybeRedirectToWelcomePage(values[0]);
         });
     }
 };

modules/UI/UI.js

@@ -1061,15 +1061,20 @@ UI.updateDTMFSupport = function (isDTMFSupported) {
 };
 
 /**
- * Show user feedback dialog if its required or just show "thank you" dialog.
+ * Show user feedback dialog if its required and enabled after pressing the
- * @returns {Promise} when dialog is closed.
+ * hangup button.
- */
+ * @returns {Promise} Resolved with value - false if the dialog is enabled and
-UI.requestFeedback = function () {
+ * resolved with true if the dialog is disabled or the feedback was already
+ * submitted. Rejected if another dialog is already displayed. This values are
+ * used to display or not display the thank you dialog from 
+ * conference.maybeRedirectToWelcomePage method.
+ */
+UI.requestFeedbackOnHangup = function () {
     if (Feedback.isVisible())
         return Promise.reject(UIErrors.FEEDBACK_REQUEST_IN_PROGRESS);
     // Feedback has been submitted already.
     else if (Feedback.isEnabled() && Feedback.isSubmitted())
-        return Promise.resolve();
+        return Promise.resolve(true);
     else
         return new Promise(function (resolve) {
             if (Feedback.isEnabled()) {
@@ -1077,10 +1082,10 @@ UI.requestFeedback = function () {
                 // window and immidiately start the conference dispose timeout.
                 if (Feedback.getFeedbackScore() > 0) {
                     Feedback.openFeedbackWindow();
-                    resolve();
+                    resolve(false);
 
                 } else { // Otherwise we'll wait for user's feedback.
-                    Feedback.openFeedbackWindow(resolve);
+                    Feedback.openFeedbackWindow(() => resolve(false));
                 }
             } else {
                 // If the feedback functionality isn't enabled we show a thank