[wp-trac] [WordPress Trac] #43697: Add theme update counter in admin theme menu item

[WordPress Trac]

#43697: Add theme update counter in admin theme menu item
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 Reporter:  mukesh27                             |       Owner:
                                                 |  SergeyBiryukov
     Type:  enhancement                          |      Status:  reviewing
 Priority:  normal                               |   Milestone:  5.8
Component:  Themes                               |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-screenshots dev-       |     Focuses:  ui,
  feedback needs-testing has-testing-info        |  administration
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Comment (by sannevndrmeulen):

 Test feedback:

 - MacOS 10.14.6
 - Google Chrome 90.0.4430.93
 - WordPress 5.8-alpha-50821

 1. Once I got the patch working I see that the notification is displayed
 behind **Appearance**.
 2. When I update a theme the notification updates too, lowering the number
 of remaining themes that require an update.
 3. -
 4. The number behind **Appearance** matches the number shown for
 **Dashboard -> Updates**.
 5. -
 6. Same behaviour as in step 1, 2, and 4. However, I did notice that the
 placement of the notification bubbles looks slightly different on mobile.
 7. -

 Steps that still require testing:

 - Check it on the PHP8
 - Check the multisite
 - Confirm that it works with Paid Themes

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Ticket URL: <https://core.trac.wordpress.org/ticket/43697#comment:16>
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