[wp-trac] [WordPress Trac] #53512: JS errors when displaying legacy widgets using Twenty Seventeen theme

[WordPress Trac]

#53512: JS errors when displaying legacy widgets using Twenty Seventeen theme
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 Reporter:  Boniu91       |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.8
Component:  Widgets       |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Changes (by Clorith):

 * keywords:  needs-patch => has-patch


Comment:

 This appears to be related to the `assets/js/global.js` file in the theme,
 which expects markup to exist on the page if sidebars are defined, but
 that markup is missing since only the widget it self and headers/footers
 of the page are loaded in the iframe used to display legacy widgets
 (widgets added prior to WordPress 5.8).

 [attachment:"53512.patch"] ensures the `$sidebar` variable is defined, and
 as it returns a jQuery array of objects (as it is defined using
 `.find()`), it also checks that there is at least one entry in that array.
 If neither of these cases ring true, it will return without trying to
 perform manipulations on the meta area of the theme.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53512#comment:4>
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