Resolve #7874 - stop too many fetch calls to docmanager-extension on …

…first load

packages/docmanager-extension/src/index.ts

@@ -241,9 +241,23 @@ ${fileTypes}`;
         return { ...plugin, schema };
       }
     });
+
+    //callback to registry change that ensures not to invoke reload method when there is already a promise that is pending
+    let reloadSettingsRegistry = () => {
+      let promisePending = false;
+
+      return async () => {
+          if(!promisePending) {
+            promisePending = true;
+            await settingRegistry.reload(pluginId);
+            promisePending = false;
+          }
+      };
+    };
+
     // If the document registry gains or loses a factory or file type,
     // regenerate the settings description with the available options.
-    registry.changed.connect(() => settingRegistry.reload(pluginId));
+    registry.changed.connect(reloadSettingsRegistry());
 
     return docManager;
   }