Make app.composer.show redraw synchronous, implement promises in reply, edit, and new discussion actions properly

js/src/forum/components/IndexPage.js

@@ -296,16 +296,18 @@ export default class IndexPage extends Page {
    * @return {Promise}
    */
   newDiscussionAction() {
-    if (app.session.user) {
-      app.composer.load(DiscussionComposer, { user: app.session.user });
-      app.composer.show();
+    return new Promise((resolve, reject) => {
+      if (app.session.user) {
+        app.composer.load(DiscussionComposer, { user: app.session.user });
+        app.composer.show();
 
-      return Promise.resolve(app.composer);
-    } else {
-      app.modal.show(LogInModal);
+        return resolve(app.composer);
+      } else {
+        app.modal.show(LogInModal);
 
-      return Promise.reject();
-    }
+        return reject();
+      }
+    });
   }
 
   /**

js/src/forum/states/ComposerState.js

@@ -82,7 +82,7 @@ class ComposerState {
     if (this.position === ComposerState.Position.NORMAL || this.position === ComposerState.Position.FULLSCREEN) return;
 
     this.position = ComposerState.Position.NORMAL;
-    m.redraw(true);
+    m.redraw.sync();
   }
 
   /**

js/src/forum/utils/PostControls.js

@@ -136,10 +136,12 @@ export default {
    * @return {Promise}
    */
   editAction() {
-    app.composer.load(EditPostComposer, { post: this });
-    app.composer.show();
+    return new Promise((resolve) => {
+      app.composer.load(EditPostComposer, { post: this });
+      app.composer.show();
 
-    return Promise.resolve(app.composer);
+      return resolve()
+    });
   },
 
   /**