Comment and term meta lazyloading for `WP_Query` loops, introduced in 4.4,
depended on filter callback methods belonging to `WP_Query` objects. This meant
storing `WP_Query` objects in the `$wp_filter` global (via `add_filter()`),
requiring that PHP retain the objects in memory, even when the local variables
would typically be expunged during normal garbage collection. In cases where a
large number of `WP_Query` objects were instantiated on a single pageload,
and/or where the contents of the `WP_Query` objects were quite large, serious
performance issues could result.
We skirt this problem by moving metadata lazyloading out of `WP_Query`. The
new `WP_Metadata_Lazyloader` class acts as a lazyload queue. Query instances
register items whose metadata should be lazyloaded - such as post terms, or
comments - and a `WP_Metadata_Lazyloader` method will intercept comment and
term meta requests to perform the cache priming. Since `WP_Metadata_Lazyloader`
instances are far smaller than `WP_Query` (containing only object IDs), and
clean up after themselves far better than the previous `WP_Query` methods (bp
only running their callbacks a single time for a given set of queued objects),
the resource use is decreased dramatically.
See [36525] for an earlier step in this direction.
Props lpawlik, stevegrunwell, boonebgorges.
Fixes#35816.
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- Cache the output in non-persistent cache.
- Cache the result from `wp_mkdir_p()` in persistent cache (when present).
- Introduce `wp_get_upload_dir()` for use when not uploading files. It is equivalent to `wp_upload_dir()` but does not check for the existence or create the upload directory.
- Change tests to use the non-cached `_wp_upload_dir()`. They change options on the fly (should never be used in production) to simulate different environments.
- Introduce `_upload_dir_no_subdir()` and `_upload_dir_https()` to facilitate testing. These use the proper `upload_dir` filter to simulate different environments.
Props kovshenin, azaozz.
See #34359.
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Backbone, from 1.1.2 to 1.2.3. Underscore, from 1.6.0 to 1.8.3.
The new versions of Backbone and Underscore offer numerous small bug fixes and some optimizations and other improvements. Check the [http://backbonejs.org/#changelog Backbone changelog] and [http://underscorejs.org/#changelog Underscore changelog] for the full details.
The new versions include some significant changes that may break existing code. Plugins or themes that rely on the bundled Backbone and/or Underscore libraries should carefully check functionality with the latest versions and run any available unit tests to ensure compatibility.
Some changes of note that were addressed in core as part of this upgrade:
* `_.flatten` no longer works with objects since Underscore.js 1.7. `_.flatten()` working with objects was an unintended side-affect of the implementation, see [https://github.com/jashkenas/underscore/issues/1904#issuecomment-60241576 underscore#1904]. Check any `_flatten` usage and only flatten arrays.
* As of Backbone 1.2.0, you can no longer modify the `events` hash or your view's `el` property in `initialize`, so don't try to modify them there.
* Since Underscore 1.7, Underscore templates no longer accept an initial data object. `_.template` always returns a function now so make sure you use it that way.
Props adamsilverstein.
Fixes#34350.
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Introduces `WP_Customize_Manager::get_previewable_devices()` with a `customize_previewable_devices` filter to change the default device and which devices are available for previewing. This is a feature that was first pioneered on WordPress.com.
Props celloexpressions, folletto, valendesigns, westonruter, welcher, adamsilverstein, michaelarestad, Fab1en.
Fixes#31195.
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Lazyloading for comment meta and term meta, introduced into `WP_Query` in
4.4, used flags - `updated_term_meta_cache` and `updated_comment_meta_cache` -
in an attempt to prevent cache priming from happening more than once per query
object. This technique was mostly effective, but not entirely efficient, since
the flag didn't prevent the `lazyload_*_meta` callbacks from running. The
obvious solution - removing the filter callback after it'd be run once - was
dismissed for 4.4 because of concerns that `remove_filter()` could disable
lazyloading too generally in the context of nested queries, due to the way
`_wp_filter_build_unique_id()` doesn't always build sufficiently unique IDs for
similar objects. However, further testing shows that this concern is only valid
in a very small subset of cases, while the cost of keeping the query objects in
memory, via the `$wp_filter` global, is quite significant. As such, this
changeset removes the flags in favor of the `remove_filter()` technique.
See #35454, #35816.
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When the same nav menu is shown multiple times on a page, only the first instance of the nav menu will include `id` attributes. Subsequent instances will have the `id` attributes omitted. However, in both cases the underlying nav menu item's post ID is available among the `class` names, so the post ID can be more reliably obtained from `class` instead of the `id` attribute.
Amends [36383].
Fixes#32681.
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Multiple improvements to the RSS2 automated tests along with the addition of Atom tests.
1. General whitespace cleanup (since the rss2 file serves as the base of the atom file).
2. Adds an author and category to the tests.
3. Since the content of the posts is the same, we don't need to test all of the post content.
4. Adds many posts so that the post count can be checked
Props stevenkword
Fixes#35160.
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Instead of returning a value for each of the related table column lengths, return an array of all of the column lengths used in the comment form.
Better fallback handling, where each field falls back to the expected max_length instead of an arbitrary number.
Props azaozz.
Fixes#10377.
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In [33963], `comment_form_title()` was refactored so that it no longer made
reference to the `$comment` global. This broke some functionality within the
comment form, as certain template would no longer be able to access the
"current" comment.
Props d4z_c0nf, WisdmLabs, boonebgorges.
Fixes#35624.
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The `$delete_all` flag in `delete_metadata()` triggers cache invalidation for
multiple objects. Previously, invalidation took place for all objects matching
the `$meta_key` parameter, regardless of whether `$meta_value` was also set.
This resulted in overly aggressive invalidation.
Props rahal.aboulfeth.
Fixes#35797.
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In the Edit Menu screen, each menu item creates 11 form input elements. In menus with more than 71 menu items, often items after the 71st weren't saved. This was because PHP's runtime configuration `max_input_vars` default value is 1000. Large menus exceed this, so PHP didn't populate the `$_POST` superglobal for the latter menu items.
The entire form is now JSON-encoded into a single input which populates `$_POST` manually on form submission.
This was attempted previously in [36506] which was reverted in [36507]. Some form fields were not being slurped into the form's JSON representation, and it did not scale for a site with many posts. This approach fixes those problems.
Props ocean90, afercia.
See #14134.
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In the Edit Menu screen, each menu item creates 11 form input elements. In menus with more than 71 menu items, often items after the 71st weren't saved. This was because PHP's runtime configuration `max_input_vars` default value is 1000. Large menus exceed this, so PHP didn't populate the `$_POST` superglobal for the latter menu items.
The entire form is now JSON-encoded into a single input which populates `$_POST` manually on form submission.
See #14134.
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The `$orderby` parameter of `get_terms()` now accepts the following values,
related to term meta:
* 'meta_value'
* 'meta_value_num'
* the value of the `$meta_key` parameter
* any key from the `$meta_query` array
This brings order-by-meta support for terms in line with post, comment, and
user queries.
As a byproduct of these improvements, `$meta_key` and `$meta_value` parameters
have been introduced to `get_terms()`. They interact with `$meta_query` in the
same way as in `WP_Query` and other query classes.
Props jadpm, eherman24.
Fixes#34996.
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This provides better parity with `get_queried_object()`, which will return the
first taxonomy/term matched by the current query.
[29891] introduced the abnormal behavior for the 'taxonomy' and 'term'
query vars.
Props Chouby.
Fixes#35619.
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- Fix not displaying anything when the URL is only a fragment. Show the whole URL.
- Fix editing a link when it is the very first word in the editor.
- Fix editing a link then some of the surrounding text or space is selected. Change the selection to only the link node.
- Add placeholder when adding new link.
See #33301.
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The changes introduced in [36381], while logical and clearly awesome, introduce
the potential for much breakage. Those who want to query for comments with a
null `comment_post_ID` should use `'post_in' => array( 0 )` instead.
Reverts [36381], [36387].
See #35090.
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Although it may seem counterintuitive at first, in very limited cases it's
better to remove improper semantics (this is not a tabular data table) in
order to reduce noise for screen reader users and simplify all the things.
Also improves headings to better separate sections.
Fixes#34780.
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Drew Jaynes
Boone Gorges
Andrew Ozz
Dominik Schilling
Jeremy Felt
Andrea Fercia
Ryan McCue
Weston Ruter
Rachel Baker
Aaron Jorbin
Eric Lewis
Sergey Biryukov
Gary Pendergast