Better saving of features when focus is lost, esp on mobile browsers

Logic/Actors/PendingChangesUploader.ts

@@ -37,6 +37,22 @@ export default class PendingChangesUploader{
             }
         });
         
+        document.onfocus = () => {
+            changes.flushChanges("OnFocus")
+        }
+
+        document.onblur = () => {
+            changes.flushChanges("OnFocus")
+        }
+        try{
+            document.addEventListener("visibilitychange", () => {
+                changes.flushChanges("Visibility change")
+            }, false);
+        }catch(e){
+            console.warn("Could not register visibility change listener", e)
+        }
+
+
         window.onbeforeunload = function(e){ 
             
             if(changes.pending.data.length == 0){

Models/Constants.ts

@@ -2,7 +2,7 @@ import { Utils } from "../Utils";
 
 export default class Constants {
     
-    public static vNumber = "0.5.2b";
+    public static vNumber = "0.5.2c";
 
     // The user journey states thresholds when a new feature gets unlocked
     public static userJourney = {