* 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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* Add `customize_value_custom_css` filter to `WP_Customize_Custom_CSS::value()` method.
* Introduce `customize_update_custom_css_post_content_args` filter in `WP_Customize_Custom_CSS::update()` method.
* Make clear that `wp_get_custom_css()` and `wp_get_custom_css` filter are specifically for obtaining the value to render/display. Eliminate use of `wp_get_custom_css()` when getting the setting value. Use the underlying `post_value` directly when `is_previewed`.
* Move anonymous functions handing JS previewing for `custom_logo`, `custom_css`, and `background` into named functions on the `wp.customize.settingPreviewHandlers` to allow plugins to override/extend preview logic.
* Update `_custom_background_cb` to always print a `style` tag wen in the customizer preview, and update background preview logic to replace existing style element instead of appending a new style to the head so that background changes don't unexpectedly override any Custom CSS in the preview's stylesheet cascade.
Props westonruter, georgestephanis.
See #22058.
Fixes#38672.
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"Header Visuals" is a bit vague since the title/tagline are arguably
also “header visuals”. "Header Media" is more descriptive and is
consistent with how we refer to images/videos throughout core.
Props bradyvercher.
Fixes#38756.
Built from https://develop.svn.wordpress.org/trunk@39205
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Removes the `.customize-partial-edit-shortcut-left-margin` class which was not effective on some themes, created a worse experience for other themes, and which did not recalculate when the preview was reflowed or resized. Now some small-width media queries are added to handle common cases while more dramatic issues can be handled by the theme. Also renames `Partial.positionEditShortcut()`to `Partial.addEditShortcutToPlacement()` which is a more accurate description of its function.
Props sirbrillig, sstoqnov.
See #38651, #27403.
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Restoring the current user context when saving a setting ensures filters apply as expected, such as Kses. When a user is not associated with a given setting change, continue to override `capability` to be `exist` when saving. Skip overwriting setting values in a changeset that have not changed, facilitating concurrent editing and amending a changeset by a user with fewer privileges.
See #30937.
Fixes#38705.
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Additionally, use these meta-caps in the REST API endpoints.
Previously, register_meta()'s auth_callback had no effect for non-post meta. This introduces `{add,edit,delete}_{comment,term,user}_meta` meta-caps to match the existing post meta capabilities. These are currently only used in the REST API.
Props tharsheblows, boonebgorges.
Fixes#38303, fixes#38412.
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The CSS property `background-attachment: fixed` is disabled in some mobile browsers for performance reasons. So here, the fix increases the breakpoint where the `background-attachment: fixed` is applied to the front page images. Doing this removes the fixed backgrounds and the issue from all smaller screens, but the downside is that it also removes the fixed backgrounds from smaller laptops. It's also possible future devices could fall into this breakpoint, but this seems to be the most practical solution.
Props laurelfulford.
Fixes#38395.
Built from https://develop.svn.wordpress.org/trunk@39176
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