Add a register_sidebar_defaults filter

[powerbuoy]

Being able to change the register_sidebar defaults on a theme basis would be excellent for those of us who don't render our widgets in a list.

Today we have to specify before_widget and after_widget on every call to register_sidebar, being able to do this instead would be an improvement:

<?php
add_filter('register_sidebar_defaults', function ($defaults) {
    $defaults['before_widget'] = '<article id="widget-%1$s" class="%2$s">';
    $defaults['after_widget'] = '</article>';

    return $defaults;
});

[patilvikasj]

Introduced new filter <code>register_sidebar_defaults</code>

[patilvikasj]

Introduced new filter register_sidebar_defaults

[SergeyBiryukov]

In 46147:

Widgets: Introduce register_sidebar_defaults filter for default arguments in register_sidebar().

Props patilvikasj, powerbuoy.
Fixes #48033.

[desrosj]

In 48045:

General: Continuing to work towards a passing PHP Compatibility scan.

• Add phpcs:ignore statements to compatibility checks in PHPMailer.
• Remove quotes around the assertion in an assert() call. This will trigger a deprecated notice under certain conditions on PHP 7.2.

Props jrf, desrosj.
See #49922, #48033.