Hook docs pinking shears.

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Fix JSHint error. props atimmer. see #26061.
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Add more columns in the theme browser on screens over 2000px wide to ensure that theme screenshots never appear larger than their resolution allows. Fixes #26172, props shaunandrews.


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Avoid a PHP notice on Edit Menus screen when a menu is attached to a non-existing location.

props nofearinc.
fixes #26287.
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