focus search input when opening emoji picker

src/components/emoji_picker/emoji_picker.js

@@ -245,6 +245,7 @@ const EmojiPicker = {
       this.filteredEmojiGroups = this.getFilteredEmojiGroups()
       if (!oldContentLoaded) {
         this.$nextTick(() => {
+          this.$refs.search.focus()
           if (this.defaultGroup) {
             this.highlight(this.defaultGroup)
           }

src/components/emoji_picker/emoji_picker.vue

@@ -71,6 +71,7 @@
               class="form-control"
               :placeholder="$t('emoji.search_emoji')"
               @input="$event.target.composing = false"
+              ref="search"
             >
           </div>
           <div