Clean composer promises (#1439)

* Remove unused login promise code

* Make promise usage consistent across composer action methods

js/src/forum/components/IndexPage.js

@@ -159,7 +159,7 @@ export default class IndexPage extends Page {
         icon: 'fas fa-edit',
         className: 'Button Button--primary IndexPage-newDiscussion',
         itemClassName: 'App-primaryControl',
-        onclick: this.newDiscussion.bind(this),
+        onclick: this.newDiscussionAction.bind(this),
         disabled: !canStartDiscussion
       })
     );
@@ -339,43 +339,29 @@ export default class IndexPage extends Page {
   }
 
   /**
-   * Log the user in and then open the composer for a new discussion.
+   * Open the composer for a new discussion or prompt the user to login.
    *
    * @return {Promise}
    */
-  newDiscussion() {
+  newDiscussionAction() {
     const deferred = m.deferred();
 
     if (app.session.user) {
-      this.composeNewDiscussion(deferred);
+      const component = new DiscussionComposer({ user: app.session.user });
+
+      app.composer.load(component);
+      app.composer.show();
+
+      deferred.resolve(component);
     } else {
-      app.modal.show(
-        new LogInModal({
-          onlogin: this.composeNewDiscussion.bind(this, deferred)
-        })
-      );
+      deferred.reject();
+
+      app.modal.show(new LogInModal());
     }
 
     return deferred.promise;
   }
 
-  /**
-   * Initialize the composer for a new discussion.
-   *
-   * @param {Deferred} deferred
-   * @return {Promise}
-   */
-  composeNewDiscussion(deferred) {
-    const component = new DiscussionComposer({user: app.session.user});
-
-    app.composer.load(component);
-    app.composer.show();
-
-    deferred.resolve(component);
-
-    return deferred.promise;
-  }
-
   /**
    * Mark all discussions as read.
    *

js/src/forum/utils/DiscussionControls.js

@@ -171,6 +171,8 @@ export default {
         deferred.reject();
       }
     } else {
+      deferred.reject();
+
       app.modal.show(new LogInModal());
     }
 

js/src/forum/utils/PostControls.js

@@ -111,10 +111,20 @@ export default {
 
   /**
    * Open the composer to edit a post.
+   *
+   * @return {Promise}
    */
   editAction() {
-    app.composer.load(new EditPostComposer({ post: this }));
+    const deferred = m.deferred();
+
+    const component = new EditPostComposer({ post: this });
+
+    app.composer.load(component);
     app.composer.show();
+
+    deferred.resolve(component);
+
+    return deferred.promise;
   },
 
   /**