Since WordPress 4.2, `utf8mb4` is a natively supported and encouraged type of installation. Unfortunately some WooCommerce database tables fail to get created in these types of installations (with something like the below settings):
```
define( 'DB_CHARSET', 'utf8mb4' );
define( 'DB_COLLATE', 'utf8mb4_unicode_ci' );
```
This commit takes a queue from WordPress core's `schema.php` and limits the length of index `KEY`s to `191`.
2.5 release doesn’t have enough user-facing features to justify a
full-blown welcome page, and translation credits are no longer
obtainable after translate.wordpress switch. Removed the page to keep
things streamlined.
@claudiosmweb @mattyza
This merges and adapts
https://github.com/kloon/woocommerce-large-sessions for core. Closes
#6846.
Differences:
- Rather than delete each cache key individually, this invalidates all
at once (idea from https://core.trac.wordpress.org/ticket/4476)
- Removes ‘replace’ which increments session_id keys unnecessarily.
- Fixes remove/restore cart sessions from making it dirty each page load
Kudos to @kloon for the bulk of the work and testing on Woo.com.
cc @claudiosmweb
Mike Jolley
Justin Shreve
John James Jacoby
Shiva Poudel
Fredrik Forsmo
Claudio Sanches
Scrutinizer Auto-Fixer
James Collins