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 `$format` parameter has been added to `WP_Comment::get_children()`. This param allows you to request a flattened array of comment children, suitable for feeding into `Walker_Comment`.
* `WP_Query` loops are now informed about total available comment counts and comment pages by the `WP_Comment_Query` (`found_comments`, `max_num_pages`), instead of by `Walker_Comment`.
Aside from radical performance improvements in the case of a post with many
comments, this changeset fixes a bug that caused the first page of comments to
be partial (`found_comments` % `comments_per_page`), rather than the last, as
you'd expect.
Props boonebgorges, wonderboymusic.
Fixes#8071.
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* `get_the_comments_navigation()` and `the_comments_navigation()` for navigation to the next and previous page of comments.
* `get_the_comments_pagination()` and `the_comments_pagination()` for paginated navigation between pages of comments. Uses `paginate_comments_links()`.
This reduces the need for themes to define their own sets of comment navigation
functions, like Twenty Fifteen and others.
Completes the navigation template tag API started in #29808 for posts.
Fixes#30589.
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If your plugin or site does rely on this behaviour, the arguments that are passed to `register_post_type()` should be altered so that `show_ui` is `true`, and arguments such as `show_in_menu`, `show_in_nav_menus`, and `show_in_admin_bar` are `false`.
Fixes#33763
Props swissspidy, johnbillion
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Since [29248], a table join has not been necessary to process the
`$excluded_terms` parameter of `get_adjacent_post()`. Aside from adding extra
overhead, this join meant that post records that don't have any corresponding
rows in `wp_term_relationships` were erroneously excluded from results.
Fixes#32833.
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* 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.
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- Filter and select the content on the PHP side. Then pass only the needed data to JS.
- Add the suggested post title and contend directly to the HTML.
- Standardise the data type names.
- Some cleanup/reduction of the code in the bookmarklet.
See #31373.
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The 'cpage' query var is only set when using `comments_template()` to display
comments. If displaying them in a context where 'cpage' is not yet set, the
default value should be 1, not 0.
Props MomDad, couturefreak.
Fixes#20319.
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- Improve handling of the data, both from the bookmarklet and from server-side parsing.
- Standardize on processing the data in PHP and remove duplicate code from JS.
- Improve the bookmarklet code and remove pre-filtering of the data.
Part props stephdau, see #31373.
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- Hard-code the minified bookmarklet js. Adding the non-minified bookmarklet to the browser bookmarks bar may have unexpected effect.
- Fix type juggling when checking the bookmarklet version.
Props stephdau, see #31373.
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