[wp-trac] [WordPress Trac] #27454: Customizer file uploader should indicate when an upload is happening

[WordPress Trac]

#27454: Customizer file uploader should indicate when an upload is happening
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 Reporter:  cliffseal    |       Owner:
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Appearance   |     Version:  3.8
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:  ui, javascript
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Comment (by westonruter):

 We could utilize the new `processing` state in 3.9 to indicate when the
 spinner should be displayed. This is used in Widget Customizer to prevent
 saving the settings before the Widget logic can return with the sanitized
 widget instances. We could also increment the `processing` state when an
 image upload is happening, and show a spinner when `processing` is not
 `0`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/27454#comment:3>
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