If you create a spinner in a hidden element and then show the
element, the spinner is placed differently than if you had created
the spinner while the element was visible. This commit makes it so
that we never create spinners while their parent is hidden.
(imported from commit a21e68976d70fcceece30ee35f5e7cf6f9490497)
This allows us to use a uniform style across all our spinners. It
also cuts down on boilerplate HTML.
(imported from commit 9879f38e0f1ca8edd40a937753811e329447262d)