Fix submenu footer blocking items in admin

- items longer then the page height are no longer broken by the submenu footer
- long lists of submenu items are no longer blocked by the footer (version number)

CHANGELOG.txt

@@ -7,6 +7,7 @@ Changelog
  * Removed leftover Python 2.x compatibility code (Sergey Fedoseev)
  * Combine flake8 configurations (Sergey Fedoseev)
  * Fix: Rename documents listing column 'uploaded' to 'created' (LB (Ben Johnston))
+ * Fix: Submenu items longer then the page height are no longer broken by the submenu footer (Igor van Spengen)
 
 2.7 LTS (xx.xx.xxxx) - IN DEVELOPMENT
 ~~~~~~~~~~~~~~~~~~~~

CONTRIBUTORS.rst

@@ -417,6 +417,7 @@ Contributors
 * kailwallin
 * ryanomor
 * Thijs Baaijen
+* Igor van Spengen
 
 Translators
 ===========

client/scss/components/_main-nav.scss

@@ -388,6 +388,10 @@ body.explorer-open {
             width: $menu-width;
         }
 
+        ul {
+            position: relative;
+        }
+
         h2 {
             display: block;
             padding: 0.2em 0;
@@ -409,6 +413,11 @@ body.explorer-open {
 
         .footer {
             position: absolute;
+
+            &-submenu {
+                position: sticky;
+                max-height: unset;
+            }
         }
 
     }

docs/releases/2.8.rst

@@ -23,6 +23,7 @@ Bug fixes
  * Removed leftover Python 2.x compatibility code (Sergey Fedoseev)
  * Combine flake8 configurations (Sergey Fedoseev)
  * Rename documents listing column 'uploaded' to 'created' (LB (Ben Johnston))
+ * Submenu items longer then the page height are no longer broken by the submenu footer (Igor van Spengen)
 
 Upgrade considerations
 ======================

wagtail/admin/templates/wagtailadmin/shared/menu_settings_menu_item.html

@@ -2,7 +2,7 @@
 {% load wagtailcore_tags %}
 
 {% block menu_footer %}
-    <li class="footer">
+    <li class="footer footer-submenu">
         <div class="menu-item"><p class="wagtail-version">Wagtail v.{% wagtail_version %}</p></div>
     </li>
 {% endblock %}