Don't bill (subtract gems) multiple times for multiple unlock item set calls (#12116)

* Issue 11050 - Small tuneups to unlock.js

- Use includes i.o. indexOf
- Extract small function for object setting duplication
- Use every instead of custom counter

* Issue 11050 - Properly store purchased items when purchasing them

* Issue 11050 - Couple more tuneups in unlock.js and implemented partial failure scenario

* Issue 11050 - Fix last lint issue

* Issue 11050 - Check path for gear i.o. failing to write it to purchased

* Issue 11050 - Guarantee variation coverage in tests

* Issue 11050 - Use startsWith instead of includes for background check

* Issue 11050 - Don't unlock lost items

website/client/src/components/messages/messageList.vue

@@ -6,7 +6,7 @@
     <div class="row loadmore">
       <div v-if="canLoadMore && !isLoading">
         <div class="loadmore-divider-holder">
-        <div class="loadmore-divider"></div>
+          <div class="loadmore-divider"></div>
         </div>
         <button
           class="btn btn-secondary"
@@ -14,9 +14,9 @@
         >
           {{ $t('loadEarlierMessages') }}
         </button>
-      <div class="loadmore-divider-holder">
-        <div class="loadmore-divider"></div>
-      </div>
+        <div class="loadmore-divider-holder">
+          <div class="loadmore-divider"></div>
+        </div>
       </div>
       <h2
         v-show="isLoading"

website/client/src/pages/private-messages.vue

@@ -72,8 +72,8 @@
           />
         </div>
         <button
-          class="btn btn-secondary"
           v-if="canLoadMoreConversations"
+          class="btn btn-secondary"
           @click="loadConversations()"
         >
           {{ $t('loadMore') }}