Merge pull request #3974 from HDinger/fix/22270-select–box-too-small-on-wiki-page

[22270] Select box too small on wiki page

app/assets/stylesheets/content/_forms.sass

@@ -492,6 +492,9 @@ input[readonly].-clickable
   // remove background image after/if upgrade
   background-image: url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20version%3D%221.1%22%20width%3D%2232%22%20height%3D%2224%22%20viewBox%3D%220%200%2032%2024%22%3E%3Cpolygon%20points%3D%220%2C0%2032%2C0%2016%2C24%22%20style%3D%22fill%3A%20black%22%3E%3C/polygon%3E%3C/svg%3E")
 
+  &.parent-select
+    height: 100%
+
   &[multiple]
     background-image: none
     padding-right: $form-padding