Sergey Biryukov ba7503322f Editor: Ensure get_block_templates() returns unique templates or template parts.
The function was using the `array_column()` PHP function on an array of objects, which works as expected on PHP 7 or later, but not on PHP 5.6.

This resulted in customized templates being listed multiple times on the Templates and Template Parts screens, and being repeatedly added between lists when switching between the screens.

The issue is now resolved by replacing `array_column()` with the `wp_list_pluck()` WordPress core function, which provides consistent behavior beetween PHP versions.

Reference: [https://github.com/php/php-src/blob/PHP-7.0.0/UPGRADING#L626 PHP 7.0 Upgrade Notes: array_column()].

Props uofaberdeendarren, antonvlasenko, ironprogrammer, jonmackintosh, costdev, hellofromTonya, swissspidy, rudlinkon.
Fixes #56271.

git-svn-id: https://develop.svn.wordpress.org/trunk@53927 602fd350-edb4-49c9-b593-d223f7449a82
2022-08-23 14:50:56 +00:00
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