Merge pull request #2775 from openmsupply/#2752-fix-navigation-double…

…-handling-hardware-back

#2752 fix hardware back button being double handled

src/navigation/utilities.js

@@ -44,8 +44,14 @@ export const getRouteTitle = (pageObject, routeName) => {
 /**
  * Simple hardware backhandler which dispatches a goBack action on a
  * provided store.
+ *
+ * WARNING: if returns falsey value, event will be "double handled",
+ * which will result in the stack being popped twice.
  */
-export const backHandler = store => () => store.dispatch(goBack());
+export const backHandler = store => () => {
+  store.dispatch(goBack());
+  return true;
+};
 
 /**
  * Simple middleware which intercepts navigation actions and calls a function