[wp-trac] [WordPress Trac] #42603: Widgets Warning after activating theme and on dashboard widgets page

[WordPress Trac]

#42603: Widgets Warning after activating theme and on dashboard widgets page
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 Reporter:  ionvv         |       Owner:  obenland
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  4.9.2
Component:  Widgets       |     Version:  4.9
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:  administration
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Comment (by chetan200891):

 @obenland I was able to recreate issue. What I did.

 Installed WordPress 4.8.1
 Activate Twentysixteen Theme
 Updated to WordPress 4.9.2
 Activate TwentySeventeen Theme
 I got same warnings on Widgets page mentioned by @ionvv


 What I did again.

 Installed WordPress 4.8.1
 Activate Twentysixteen Theme
 Updated to WordPress 4.9.2
 Made changes to wp-includes/widgets.php as per patch
 [[https://core.trac.wordpress.org/attachment/ticket/42603/42603.2.diff|42603.2.diff]]
 Activate TwentySeventeen Theme
 No more warning shown on Widgets page. :)

 So for me
 [[https://core.trac.wordpress.org/attachment/ticket/42603/42603.2.diff|42603.2.diff]]
 works!

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Ticket URL: <https://core.trac.wordpress.org/ticket/42603#comment:8>
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