Try to avoid requesting user data multiple times

app/static/js/nopaque/App.js

@@ -51,8 +51,16 @@ class App {
   }
 
   getUserById(userId) {
-    return new Promise((resolve, reject) => {
-      if (userId in this.data.users) {resolve(this.users[userId]);}
+    let promise;
+
+    if (userId in this.data.users) {
+      if (this.data.users[userId] instanceof Promise) {
+        return this.data.users[userId];
+      } else {
+        return new Promise((resolve, reject) => {resolve(userValue);});
+      }
+    }
+    promise = new Promise((resolve, reject) => {
       this.socket.emit('users.user.get', userId, response => {
         if (response.code === 200) {
           this.data.users[userId] = response.payload;
@@ -62,12 +70,13 @@ class App {
         }
       });
     });
+    this.data.users[userId] = promise;
+    return promise;
   }
 
   usersPatchHandler(patch) {
     let listener;
 
-    console.log(patch);
     this.data = jsonpatch.apply_patch(this.data, patch);
     for (listener of this.eventListeners['users.patch']) {listener(patch);}
   }