FIX: don't search for tags when editing topic title

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

@@ -238,6 +238,10 @@ export default Ember.Controller.extend(bufferedProperty("model"), {
       this.set("buffered.category_id", selection.value);
     },
 
+    topicTagsChanged({ target }) {
+      this.set("buffered.tags", target.value);
+    },
+
     deletePending(pending) {
       return ajax(`/review/${pending.id}`, { type: "DELETE" })
         .then(() => {

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

@@ -24,6 +24,7 @@
               <span class="private-message-glyph">{{d-icon "envelope"}}</span>
             {{/if}}
               {{text-field id="edit-title" value=buffered.title maxlength=siteSettings.max_topic_title_length autofocus="true"}}
+
               {{#if showCategoryChooser}}
                 {{category-chooser
                   class="small"
@@ -32,10 +33,15 @@
               {{/if}}
 
               {{#if canEditTags}}
-                {{mini-tag-chooser filterable=true tags=buffered.tags categoryId=buffered.category_id}}
+                {{mini-tag-chooser
+                  filterable=true
+                  tags=(unbound buffered.tags)
+                  categoryId=(unbound buffered.category_id)
+                  onChangeTags=(action "topicTagsChanged")}}
               {{/if}}
 
               {{plugin-outlet name="edit-topic" args=(hash model=model buffered=buffered)}}
+
               <div class="edit-controls">
                 {{d-button action=(action "finishedEditingTopic") class="btn-primary submit-edit" icon="check"}}
                 {{d-button action=(action "cancelEditingTopic") class="btn-default cancel-edit" icon="times"}}