correct positioning when emoji is added

app/assets/javascripts/discourse/controllers/composer.js.es6

@@ -75,12 +75,28 @@ export default DiscourseController.extend({
 
   appendText: function(text, opts) {
     var c = this.get('model');
-    if (c) { c.appendText(text, undefined , opts); }
+    if (c) {
+      var wmd = $('#wmd-input');
+      var position = opts.position === "cursor" ? wmd.caret() : wmd.val().length;
+
+      var caret = c.appendText(text, position, opts);
+      Em.run.next(function(){
+        Discourse.Utilities.setCaretPosition(wmd[0], caret);
+      });
+    }
   },
 
-  appendBlockAtCursor: function(text) {
-    var c = this.get('model');
-    if (c) { c.appendText(text, $('#wmd-input').caret(), {block: true}); }
+  appendTextAtCursor: function(text, opts) {
+    opts = opts || {};
+    opts.position = "cursor";
+    this.appendText(text, opts);
+  },
+
+  appendBlockAtCursor: function(text, opts) {
+    opts = opts || {};
+    opts.position = "cursor";
+    opts.block = true;
+    this.appendText(text, opts);
   },
 
   categories: function() {

app/assets/javascripts/discourse/models/composer.js

@@ -312,6 +312,8 @@ Discourse.Composer = Discourse.Model.extend({
     }
 
     this.set('reply', before + text + after);
+
+    return before.length + text.length;
   },
 
   togglePreview: function() {

plugins/emoji/assets/javascripts/emoji-toolbar.js

@@ -33,7 +33,6 @@ var renderPage = Handlebars.compile(
 var closeSelector = function(){
   $('.emoji-modal, .emoji-modal-wrapper').remove();
   $('body, textarea').off('keydown.emoji');
-  $('#wmd-input').focus();
 };
 
 var showSelector = function(){
@@ -61,8 +60,9 @@ var showSelector = function(){
 
   var composerController = Discourse.__container__.lookup('controller:composer');
   $('.emoji-page a').click(function(){
-     composerController.appendText(":" + $(this).attr('title') + ":", {space: true});
+     composerController.appendTextAtCursor(":" + $(this).attr('title') + ":", {space: true});
      closeSelector();
+     return false;
   });
 
   $('body, textarea').on('keydown.emoji', function(e){