Send fresh data to the diagramming service on every request

Author: annda

script/helpers.js

@@ -25,6 +25,15 @@ function removeDiagramsEditor(handler) {
     jQuery('#diagrams-frame').remove();
 }
 
+/**
+ * Explicitly disable caching of the AJAX request.
+ */
+function disableRequestCaching() {
+    jQuery.ajaxSetup({
+        cache: false,
+    });
+}
+
 /**
  * check if name/id of new diagram is valid
  *

script/service.js

@@ -10,6 +10,9 @@ const handleServiceMessages = function( event ) {
         return;
     }
 
+    // some browsers stubbornly cache request data and mess up subsequent edits
+    disableRequestCaching();
+
     // get diagram info passed to the function
     const fullId = event.data.fullId;
     const {ns, id} = splitFullId(fullId);