Support for choosing a destination category when splitting topics.

app/assets/javascripts/discourse/controllers/split_topic_controller.js

@@ -25,31 +25,43 @@ Discourse.SplitTopicController = Discourse.ObjectController.extend(Discourse.Sel
   }.property('saving'),
 
   onShow: function() {
-    this.set('saving', false);
+    this.setProperties({
+      'controllers.modal.modalClass': 'split-modal',
+      saving: false,
+      categoryId: null,
+      topicName: ''
+    });
   },
 
-  movePostsToNewTopic: function() {
-    this.set('saving', true);
+  actions: {
+    movePostsToNewTopic: function() {
+      this.set('saving', true);
 
-    var postIds = this.get('selectedPosts').map(function(p) { return p.get('id'); }),
-        replyPostIds = this.get('selectedReplies').map(function(p) { return p.get('id'); }),
-        self = this;
+      var postIds = this.get('selectedPosts').map(function(p) { return p.get('id'); }),
+          replyPostIds = this.get('selectedReplies').map(function(p) { return p.get('id'); }),
+          self = this,
+          categoryId = this.get('categoryId'),
+          saveOpts = {
+            title: this.get('topicName'),
+            post_ids: postIds,
+            reply_post_ids: replyPostIds
+          };
 
-    Discourse.Topic.movePosts(this.get('id'), {
-      title: this.get('topicName'),
-      post_ids: postIds,
-      reply_post_ids: replyPostIds
-    }).then(function(result) {
-      // Posts moved
-      self.send('closeModal');
-      self.get('topicController').send('toggleMultiSelect');
-      Em.run.next(function() { Discourse.URL.routeTo(result.url); });
-    }, function() {
-      // Error moving posts
-      self.flash(I18n.t('topic.split_topic.error'));
-      self.set('saving', false);
-    });
-    return false;
+      if (!Ember.isNone(categoryId)) { saveOpts.category_id = categoryId; }
+
+      Discourse.Topic.movePosts(this.get('id'), saveOpts).then(function(result) {
+        // Posts moved
+        self.send('closeModal');
+        self.get('topicController').send('toggleMultiSelect');
+        Em.run.next(function() { Discourse.URL.routeTo(result.url); });
+      }, function() {
+        // Error moving posts
+        self.flash(I18n.t('topic.split_topic.error'));
+        self.set('saving', false);
+      });
+      return false;
+    }
   }
 
+
 });