views: Use tags from menu or shortcut instead of the app

- Also remove the extra unwanted space between the tags.

- This allows different shortcuts of the same app to have different tags on the
home page. Example: email shortcuts on the home page.

- This also allows custom shortcuts to have their own tags without being
attached to any app provided by FreedomBox.

- Filter shown menu items by tags on the menu item rather than tags on the app.
They could be different.

Tests:

- Home page shows shortcuts with tags.

- Apps and system pages show shortcuts with apps.

- Apps are properly filtered when tags are clicked on in the app page.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Joseph Nuthalapati <njoseph@riseup.net>

plinth/templates/card.html

@@ -20,7 +20,7 @@
     </div>
     <div class="card-title">{{ item.name }}</div>
     <div class="card-tags">
-      {% for tag in item.app.info.tags|slice:":3" %}{% trans tag %}{% if not forloop.last %}・{% endif %}{% endfor %}
+      {% for tag in item.tags|slice:":3" %}{% trans tag %}{% if not forloop.last %}・{% endif %}{% endfor %}
     </div>
   </a>
 </div>

plinth/templates/index.html

@@ -76,9 +76,7 @@
                           {{ shortcut.name }}
                         </div>
                         <div class="card-tags">
-                          {% for tag in shortcut.app.info.tags|slice:":3" %}
-                              {% trans tag %}{% if not forloop.last %}・{% endif %}
-                          {% endfor %}
+                          {% for tag in shortcut.tags|slice:":3" %}{% trans tag %}{% if not forloop.last %}・{% endif %}{% endfor %}
                         </div>
                     </a>
                 </div>

plinth/views.py

@@ -191,7 +191,7 @@ class AppsIndexView(TemplateView):
             A mismatch is when a selected tag is *not* present in the list of
             tags for menu item.
             """
-            menu_tags = set(menu_item.app.info.tags)
+            menu_tags = set(menu_item.tags)
             return [tag not in menu_tags for tag in selected_tags]
 
         def _sort_key(menu_item):