FIX: Autocomplete wasn't properly updating `d-editor`

app/assets/javascripts/discourse/components/d-editor.js.es6

@@ -301,6 +301,9 @@ export default Ember.Component.extend({
     $editorInput.autocomplete({
       template: template,
       key: ":",
+      afterComplete(text) {
+        self.set('value', text);
+      },
 
       transformComplete(v) {
         if (v.code) {

app/assets/javascripts/discourse/lib/autocomplete.js.es6

@@ -146,6 +146,10 @@ export default function(options) {
           text = text.substring(0, completeStart) + (options.key || "") + term + ' ' + text.substring(completeEnd + 1, text.length);
           me.val(text);
           Discourse.Utilities.setCaretPosition(me[0], completeStart + 1 + term.length);
+
+          if (options && options.afterComplete) {
+            options.afterComplete(text);
+          }
         }
       }
     }

app/assets/javascripts/discourse/templates/discovery.hbs

@@ -27,3 +27,5 @@
     </div>
   </div>
 </div>
+
+{{plugin-outlet "discovery-below"}}