[wp-trac] [WordPress Trac] #33311: TB_window spinner should probably disappear when loading is done

[WordPress Trac]

#33311: TB_window spinner should probably disappear when loading is done
-------------------------+-------------------------------------------------
 Reporter:  niklasbr     |       Owner:  afercia
     Type:  enhancement  |      Status:  assigned
 Priority:  normal       |   Milestone:  4.4
Component:  Plugins      |     Version:  4.2
 Severity:  normal       |  Resolution:
 Keywords:  has-patch    |     Focuses:  ui, javascript, administration,
  commit                 |  performance
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Changes (by afercia):

 * keywords:  has-patch dev-feedback => has-patch commit
 * milestone:  Awaiting Review => 4.4


Comment:

 Refreshed patch. Combines the two approaches. The CSS part reduces CPU
 usage '''while''' the spinner is being shown. Additionally, the spinner
 gets removed when the iframe loading has completed. See screenshot below,
 the re-painted area is now a small 20px x 20px square as already done for
 #33322.

 Note: uses a custom event which will be useful for #33305.

 [[Image(https://cldup.com/eKtSfVIZ-y.png)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/33311#comment:19>
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