put back waiting for sync after frontend API backend request

src/public/app/services/frontend_script_api.js

@@ -166,9 +166,7 @@ function FrontendScriptApi(startNote, currentNote, originEntity = null, $contain
         }, "script");
 
         if (ret.success) {
-            // we used to wait for max entity change here returned from the response
-            // but it's too easy to end up in infinite cycle when this is triggered as a consequence of
-            // sync event (typically from custom widget)
+            await ws.waitForMaxKnownEntityChangeId();
 
             return ret.executionResult;
         }

src/public/app/widgets/note_tree.js

@@ -1130,7 +1130,8 @@ export default class NoteTreeWidget extends TabAwareWidget {
                     //        here note tree is responsible for updating global state of the application
                     //        this should be done by tabcontext / tabmanager and note tree should only listen to
                     //        changes in active note and just set the "active" state
-                    await appContext.tabManager.getActiveTabContext().setNote(nextNotePath);
+                    // We don't await since that can bring up infinite cycles when e.g. custom widget does some backend requests which wait for max sync ID processed
+                    appContext.tabManager.getActiveTabContext().setNote(nextNotePath);
                 }
             }