Add parameter and return descriptions to the `WP_List_Table::get_pagination_arg()` DocBlock.

See #30224.

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Merge a multi-line comment into a single-line comment in wp-includes/link-template.php.

See [30166]. See #30224.

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Fix a couple of typos in the hook documentation for the `$option` filter in wp-admin/includes/class-wp-list-table.php.

Props bobbingwide.
Fixes #30229.

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Ensure the requires for the admin bootstrap are documented in all wp-admin/user/ files.

Props NikV for the initial patch.
Fixes #29111.

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Twenty Fifteen: Crashing chrome if you don't have Noto installed probably isn't the best experience  -- removing font kerning.

Props iamtakashi, fixes #30195

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Twenty Fifteen: Simplify the header, sidebar, background controls and make customization faster for users to do. This has the added benefit of fixing our bug where hidden header text wasn't being updated on color scheme switch. Nice.

Props celloexpressions, iamtakashi, fixes #30164 and #29980.

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Twenty Fifteen: accessible alt text for post thumbnail links.

Props joedolson, fixes #30076.


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Twenty Fifteen: missing spaces for code standards.

Props Jayjdk, fixes #30076.


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Twenty Fifteen: Formatting cleanup for documentation, crossing eyes, dotting tees.

Props lancewillett, MikeHansenMe, fixes #30149.

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Add some docs to `wp.media.view.EditorUploader`.

Props ericlewis.
See #29951.

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Twenty Fifteen: adding licensing info for the image used in the screenshot.

Props sakinshrestha, fixes #30156.


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Twenty Fifteen: Use the new archive template tags and make archive template titling way simpler!

Props obenland, fixes #30246.


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Twenty Fifteen: use continue reading links for auto-generated excerpts to provide a readable link for screenreaders.

Props davidakennedy, kraftbj, fixes #30135.


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In `wp_insert_term()`, clean up accidental duplicate terms after insert.

In [30056], the UNIQUE index was removed from the 'slug' column of `wp_terms`.
While we have numerous checks in place to avoid the creation of unwanted
duplicate term+term_taxonomy pairs, it's possible that in certain edge cases -
such as during the lag caused by database replication, or a race condition
involving near-simultaneous creation of more than one term - we'll end up
unwittingly inserting two identical rows.

The current changeset minimizes this risk by introducing a failsafe mechanism
into `wp_insert_term()`. After a term and term_taxonomy are INSERTed, we check
to see whether the term just created is a duplicate of an existing term; if so,
we delete the new one and keep the old one. This prevents problems caused by
replication lag, because SELECT queries that take place after an INSERT will
hit the master database; it mitigates race conditions by enforcing that the
term that was created first (ie, the one with the lowest `term_id`) is
always the "canonical" one.

Props nacin, markjaquith.
See #22023, #5809.
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Enforce ORDER BY and LIMIT clauses in `term_exists()` queries.

In case of edge cases where a duplicate term might exist in a replicated
database for a split second, these explicit query clauses ensure that
`term_exists()` will always recognize the oldest matched term as the
canonical one. See [30238] for background.

Props pento.
See #22023, #5809.
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Do not create shared taxonomy terms.

A "shared" term occurs when two entries in the `wp_term_taxonomy` table share a
single `term_id`, and thereby correspond to the same row in `wp_terms`. This
changeset stops the practice of creating shared terms: each new row in
`wp_term_taxonomy` will receive its own row in `wp_terms`. The new strategy
for term creation depends on whether the installation's database schema is up
to date for 4.1:

* If so, terms are allowed to be created with the same slug as an existing term, as long as they are in different taxonomies and do not share a parent. Thus, a new tag with the slug 'wordpress' can exist alongside a category with the slug 'wordpress'.
* If not, new terms will be forced to have unique slugs. Thus, on an installation containing a category with the slug 'wordpress', a new tag 'WordPress' will get the slug 'wordpress-2'.

Fixes #21950. See #5809.
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Split shared taxonomy terms during term update.

When updating an existing taxonomy term that shares its `term_id` with
another term, we generate a new row in `wp_terms` and associate the updated
term_taxonomy_id with the new term. This separates the terms, such that
updating the name of one term does not change the name of any others.

Note that this term splitting only occurs on installations whose database
schemas have been upgraded to version 30133 or higher. Note also that shared
terms are only split when run through `wp_update_term()`, as on edit-tags.php;
we will wait until a future release of WordPress to force the splitting of all
shared taxonomy terms.

Props boonebgorges, rmccue, greuben, garyc40, wonderboymusic, imath, jesin.
Fixes #5809.
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