With [38951] the support for custom page templates has been extended to all post
types. By making the visible meta box titles real labels, accessibility improves
for all users and form fields have meaningful labels.
Fixes#38790.
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This adds a new filter, `fallback_intermediate_image_sizes`, which
can be used to modify the array of image sizes created for previewing
PDFs in the media library and checks for the existence of sizes before
processing any image representations of a PDF.
Fixes#38594.
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* Ensure that starter content can apply from theme B after previewing starter content in theme A.
* Introduce new `starter_content` flag in changeset setting params which is used to capture whether a value is starter content and thus can be overridden.
* Create changeset up-front with `starter_content` flags instead of waiting for `AUTOSAVE_INTERVAL`.
* Eliminate instantiation of settings for widget instances in favor of directly calling `sanitize_widget_js_instance`. This eliminates issues with looking for widgets before they are registered.
* Ensure that non-placeholders (inline arrays instead of string references) can be supplied in starter content.
* Re-use auto-draft posts as starter content across theme switches.
* Introduce `starter_content` param for `WP_Customize_Manager::save_changeset_post()` which is `false` except when starter content is being loaded on a `fresh_site`.
See #38114.
Fixes#38541.
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Adds a callback for determining when video headers should be displayed in themes supporting custom headers. By default, video headers are only displayed on the front page of a site.
Theme authors may set a custom callback by passing `'video-active-callback' => 'mytheme_video_active_callback'` as an argument. The default callback is `is_front_page()`.
This introduces the new function `is_header_video_active()` - returns `true` on pages that should display video headers. The return value can be filtered using the new filter of the same name.
Props flixos90, bradyvercher, peterwilsoncc, joemcgill.
Fixes#38738.
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Prevents post type templates ignoring post types due to invalid characters. Each entry in the `Template Post Type` comment is run through `sanitize_key()` to match the sanitisation used by `register_post_type()`.
Fixes#38766.
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Sometimes, a language file may not exist in exactly the format or location that `get_available_languages()` expects it to be in - for sites with this level of customisation, they need to be able to add their own language files to the list of those available.
Props yoavf.
Fixes#38788.
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`get_available_languages()` is only designed to work with translations for core. Using it for plugins/themes means unnecessary `strpos()` checks and incomplete results for plugins/themes whose names are beginning with `admin-` or `ms-`.
Props swissspidy, ocean90.
Fixes#38590.
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* Use `postMessage` transport for header image settings by default when video headers are supported, and thus `the_custom_header_markup()` will necessarily be used (and thus a selective refresh partial will be available).
* Ensure that `the_custom_header_markup()` always outputs a container element in the customizer preview even if the header is empty.
* Ensure that edit shortcut appearing for custom header does not get positioned off-screen.
Props bradyvercher, westonruter.
See #38639.
Fixes#38737.
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When a page is scrolled, the top nav menu become fixed. Depending on the page content this caused issue where focused links or buttons may be hidden behind the nav menu.
Props afercia, davidakennedy, Fencer04
Fixes#38476
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For developers wanting to add their own registered collection parameters, they can now use the `rest_$type_collection_params` filter. This brings consistency with the already existing `rest_$post_type_collection_params`.
Fixes#38710.
Props jnylen0.
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With the addition of Array support in our schema validation functions, it's now possible to use these in the meta validation and sanitization steps. Also, this increases the test coverage of using registered via meta the API significantly.
Fixes#38531.
Props rachelbaker, tharsheblows.
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* Toggles `has-header-image` body class in Customizer preview whenever images or videos are added or removed.
* Hides the `.custom-header-image`div in CSS when an image or video haven't been set so preview changes are smoother.
* Also fixes the main issues in #38391 – making the preview match.
Props bradyvercher.
Fixes#38627.
See #38391.
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IE9 doesn't understands `vh ` (vertical height) when inside of an `iframe`. Normally IE9 will understand `vh` as the vertical height relative to the viewport, but in an `iframe`, IE9 thinks the vertical height is relative to the size of the whole page. So this fixes that when the site is viewed in the Customizer preview – an `iframe`.
Props laurelfulford.
Fixes#38722.
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Adds translation context for "Hide Controls" strings so translators can supply shorter strings where space is constrained. Adds styles to fade-out long the "Hide Controls" label where it would run into the device preview buttons.
Props westonruter, ocean90.
Fixes#38762.
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This helps affirm that your upload is fine, and has not been reduced down to the first page or changed into an image. This applies to the attachment details modal in the media library, where media is also now centered in the preview area.
props folletto, helen.
fixes#38717.
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Due to the `clear_update_cache` parameter not being respected, update caches were being cleared incorrectly which prevented multiple plugins to be updated at the same time in background updates - failing with a `fs_unavailable` error message.
Fixes#38024
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