WP_Post_Comments_List_Table blows up as WP_Comments_List_Table does not exist

[tyxla]

It appears that moving WP_Post_Comments_List_Table to a separate file [34223] has open up an issue with the "Comments" meta box in the single post edit administration screen. The WP_Comments_List_Table class was not found when attempting to define the WP_Post_Comments_List_Table class.

The error that is displayed in the Comments box is:

Fatal error: Class 'WP_Comments_List_Table' not found in ../src/wp-admin/includes/class-wp-post-comments-list-table.php on line 20

To fix this issue, the WP_Post_Comments_List_Table entry in _get_list_table() will also have to require the WP_Comments_List_Table class.

[tyxla]

_get_list_table(): Requiring WP_Comments_List_Table before requiring WP_Post_Comments_List_Table

[SergeyBiryukov]

In 34231:

Comments: Fix a fatal error in Comments meta box after [34223].

Props tyxla.
Fixes #33893. See #33413.