Add is_customize_preview() polyfill
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is_customize_preview() polyfill
schlessera
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Jan 5, 2022
Add is_customize_preview() polyfill
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Add a polyfill for the is_customize_preview(), as it is required for the
TwentyTwenty theme's starter content, and will fatal the site if you install
WP 5.3 first (setting TwentyTwenty as the active theme) and then downgrade
to a version of WP lower than 4.0.
Note: This is a quick fix, and a cleaner solution would be to change the
active theme on downgrading, if the current theme declares it is not
supported.
See: WordPress/twentytwenty#973