[wp-trac] [WordPress Trac] #36911: Customizer and Theme Installer spinners should have different z-index

[WordPress Trac]

#36911: Customizer and Theme Installer spinners should have different z-index
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 Reporter:  afercia       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:  4.5
 Severity:  normal        |   Keywords:
  Focuses:  ui            |
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 My bad, I think this has to do with some previous changes I've made on
 these spinners. Looks like after [36518] the "loading" spinner in the
 Customizer is hidden, at least in some browsers.

 While the spinners used in the Customizer and in the Theme installer are
 basically the same and so the CSS rule for them was grouped in just one
 rule in [36518], I think the only CSS property that has to be different is
 `z-index`. As far as I see, the Theme installer needs a value of `-1` but
 this will hide the spinner in the Customizer so it has to be `0` here.

 The fix would be trivial but I'd greatly appreciate some testing to
 confirm the issue, in different browsers.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36911>
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