Merge branch '32735-fix-right-sidebar-coming-up-short' into 'master'

Fix right-sidebar gap on mobile

Closes #32735

See merge request !11625

app/assets/stylesheets/framework/sidebar.scss

@@ -83,4 +83,8 @@
     position: fixed;
     top: $header-height;
   }
+
+  &:not(.affix-top) {
+    min-height: 100%;
+  }
 }