The old comment pagination logic had a separate block for comment threads that
appeared on a single page. After the refactoring in [34561], all comment
pagination logic is unified.
This change ensures that 'comment_order' is respected in all scenarios.
Fixes#8071.
Built from https://develop.svn.wordpress.org/trunk@34669
git-svn-id: http://core.svn.wordpress.org/trunk@34633 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Previously, the 'page_comments' toggle allowed users to disable comment
pagination. This toggle was only superficial, however. Even with
'page_comments' turned on, `comments_template()` loaded all of a post's
comments into memory, and passed them to `wp_list_comments()` and
`Walker_Comment`, the latter of which produced markup for only the
current page of comments. In other words, it was possible to enable
'page_comments', thereby showing only a subset of a post's comments on a given
page, but all comments continued to be loaded in the background. This technique
scaled poorly. Posts with hundreds or thousands of comments would load slowly,
or not at all, even when the 'comments_per_page' setting was set to a
reasonable number.
Recent changesets have addressed this problem through more efficient tree-
walking, better descendant caching, and more selective queries for top-level
post comments. The current changeset completes the project by addressing the
root issue: that loading a post causes all of its comments to be loaded too.
Here's the breakdown:
* Comment pagination is now forced. Setting 'page_comments' to false leads to evil things when you have many comments. If you want to avoid pagination, set 'comments_per_page' to something high.
* The 'page_comments' setting has been expunged from options-discussion.php, and from places in the codebase where it was referenced. For plugins relying on 'page_comments', we now force the value to `true` with a `pre_option` filter.
* `comments_template()` now queries for an appropriately small number of comments. Usually, this means the `comments_per_page` value.
* To preserve the current (odd) behavior for comment pagination links, some unholy hacks have been inserted into `comments_template()`. The ugliness is insulated in this function for backward compatibility and to minimize collateral damage. A side-effect is that, for certain settings of 'default_comments_page', up to 2x the value of `comments_per_page` might be fetched at a time.
* In support of these changes, a `$format` parameter has been added to `WP_Comment::get_children()`. This param allows you to request a flattened array of comment children, suitable for feeding into `Walker_Comment`.
* `WP_Query` loops are now informed about total available comment counts and comment pages by the `WP_Comment_Query` (`found_comments`, `max_num_pages`), instead of by `Walker_Comment`.
Aside from radical performance improvements in the case of a post with many
comments, this changeset fixes a bug that caused the first page of comments to
be partial (`found_comments` % `comments_per_page`), rather than the last, as
you'd expect.
Props boonebgorges, wonderboymusic.
Fixes#8071.
Built from https://develop.svn.wordpress.org/trunk@34561
git-svn-id: http://core.svn.wordpress.org/trunk@34525 1a063a9b-81f0-0310-95a4-ce76da25c4cd
[34268] introduced cache priming for commentmeta, enabled by default. To
ensure performance on single post pages - where commentmeta is most likely
to cause performance issues - we disable up-front cache-priming. Instead, we
prime commentmeta caches for all comments in the loop the first time
`get_comment_meta()` is called on the page.
Props bradt, dd32, wonderboymusic, boonebgorges.
Fixes#16894.
Built from https://develop.svn.wordpress.org/trunk@34270
git-svn-id: http://core.svn.wordpress.org/trunk@34234 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Takes inspiration from `WP_Post` and adds sanity to comment caching.
* Clarifies when the current global value for `$comment` is returned. The current implementation in `get_comment()` introduces side effects and an occasion stale global value for `$comment` when comment caches are cleaned.
* Strongly-types `@param` docs
* This class is marked `final` for now
Props wonderboymusic, nacin.
See #32619.
Built from https://develop.svn.wordpress.org/trunk@33891
git-svn-id: http://core.svn.wordpress.org/trunk@33860 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The new 'submit_button' and 'submit_field' parameters for `comment_form()`
allow developers to modify the markup of the submit button and its wrapper.
These params are accompanied by targeted 'comment_form_submit_button' and
'comment_form_submit_field' filters on the concatenated markup.
Props coffee2code, morpheu5, DrewAPicture, boonebgorges.
Fixes#15015.
Built from https://develop.svn.wordpress.org/trunk@31699
git-svn-id: http://core.svn.wordpress.org/trunk@31680 1a063a9b-81f0-0310-95a4-ce76da25c4cd
To better understand screen reader text, check out https://make.wordpress.org/accessibility/2015/02/09/hiding-text-for-screen-readers-with-wordpress-core/
Screen Reader text improves the user experience for screen reader users. It provides additional context for links, document forms and other pieces of a page that may exist visually, but are lost when looking only at the html of a site. This does change the output of comments_popup_link if you don't pass in values for $zero, $one, $more or $none. Theme authors can and should style <code>.screen-reader-text</code> in ways that are recommended in the above article to hide it visually.
Props joedolson
Fixes#26553
Built from https://develop.svn.wordpress.org/trunk@31388
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