- effectively hides the "Post locked" information from assistive technologies
- when a post is locked, reveals the "Post locked" information without CSS animation
- the height CSS animation didn't work anyways after [24906]
See #24553.
Fixes#44946.
Built from https://develop.svn.wordpress.org/trunk@45417
git-svn-id: http://core.svn.wordpress.org/trunk@45228 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- Change `recurse_dirsize()` to accept an array of excluded paths.
- Change so we don't calculate the sizes of dirs in wp-content twice.
- Add the size in bytes to the "debug" into.
- Add a custom DOM event after the dir sizes request is done. Can be used by plugins to "daisy chain" more requests.
- Move "WordPress directory location" and "WordPress directory size" to the top in the "Directories and Sizes" section.
- Move "Theme directory location" to the "Active Theme" section.
- Fix labels capitalization.
Props xkon, afercia, Clorith, azaozz.
Fixes#46707.
Built from https://develop.svn.wordpress.org/trunk@45220
git-svn-id: http://core.svn.wordpress.org/trunk@45029 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Arrows navigation on accordions is an optional keyboard interaction feature mentioned in the WAI-ARIA Authoring Practices. While it can add some value in some specific cases, it's not so discoverable and it's unlikely users, including assistive technologies users, would really "expect" this kind of interaction.
See #46573.
Fixes#46682.
Built from https://develop.svn.wordpress.org/trunk@45069
git-svn-id: http://core.svn.wordpress.org/trunk@44878 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The previous method for copying the debug report to the clipboard involved having a hidden `<textarea>`, but this shows up in screen readers and can't be reliably hidden.
To work around this, the button now uses the `clipboard.js` library, which automatically handles browser differences in the Clipboard API, and can load the text to copy from a `data-` attribute on the button.
Props pento, hedgefield, afercia.
Fixes#46647.
Built from https://develop.svn.wordpress.org/trunk@45044
git-svn-id: http://core.svn.wordpress.org/trunk@44853 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The Site Health score indicator isn't exactly a "progress bar" and shouldn't use ARIA roles and properties related to progress bars. Also, some browser / screen reader combinations don't announce the score properly.
- removes any ARIA
- adds a screen-reader-text "Current health score:"
- adds `role="img" aria-hidden="true" focusable="false"` to the SVG
- reduces CSS specificity simplifying unnecessary overqualified selectors
- fixes the syntax for ::after and ::before (double colon)
Fixes#46621.
Built from https://develop.svn.wordpress.org/trunk@45041
git-svn-id: http://core.svn.wordpress.org/trunk@44850 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The Site Health tool serves two purposes:
- Provide site owners with information to improve the performance, reliability, and security of their site.
- Collect comprehensive debug information about the site.
By encouraging site owners to maintain their site and adhere to modern best practices, we ultimately improve the software hygeine of both the WordPress ecosystem, and the open internet as a whole.
Props Clorith, hedgefield, melchoyce, xkon, karmatosed, jordesign, earnjam, ianbelanger, wpscholar, desrosj, pedromendonca, peterbooker, jcastaneda, garyj, soean, pento, timothyblynjacobs, zodiac1978, dgroddick, garrett-eclipse, netweb, tobifjellner, pixolin, afercia, joedolson, birgire.
See #46573.
Built from https://develop.svn.wordpress.org/trunk@44986
git-svn-id: http://core.svn.wordpress.org/trunk@44817 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- standardizes the Comment count string to `%s Comment in moderation', '%s Comments in moderation` so it can be bulk-updated
- adds the string as visually hidden text in the admin menu
- introduces an `updateInModerationText` JS simple function, responsible to correctly update all the related text using the data from the AJAX response
- adds a visually hidden text "1 Privacy Policy update" to the Privacy menu items count
- adds/improves translators comments
Changes that apply to all the count bubbles (Updates, plugins, etc.)
- makes the bubbles and their text slightly bigger
- improves the active menu item bubble contrast by changing the background color to red (option 2 in the screenshot attached in a previous comment)
Props adamsoucie, afercia.
Fixes#33030.
Built from https://develop.svn.wordpress.org/trunk@44924
git-svn-id: http://core.svn.wordpress.org/trunk@44755 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Old browsers didn't support the HTML placeholder attribute. For a number of years, `<label>` elements have been used in a few places in WordPress to emulate placeholders. It's time to improve semantics and interaction, use real placeholders when possible, and clean up some JavaScript.
- Quick Draft widget: it now uses visible `<label>` elements and a real `placeholder` attribute
- removes the related JavaScript
- Post title:
- keeps the "prompt" label for backwards compatibility
- improves the JavaScript to make the "prompt" label stay visible on focus and disappear when typing, like real placeholder do
- changes the post "prompt" text from "Enter title here" to "Add title" for consistency with the Block Editor
- cleans-up some CSS
Props Cheffheid, afercia.
Fixes#42390.
Built from https://develop.svn.wordpress.org/trunk@44896
git-svn-id: http://core.svn.wordpress.org/trunk@44727 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- makes the "Cancel" button always visible: this allows to generate a new password also on small screens
- moves focus back to the Generate Password button when closing the form
- changes the password reset show/hide button from a clickable `<span>` element to a real `<button>` element
- improves the CSS
Props janak007, afercia.
Fixes#42853.
Built from https://develop.svn.wordpress.org/trunk@44895
git-svn-id: http://core.svn.wordpress.org/trunk@44726 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- debounces the widgets search to avoid multiple `speak()` audible messages while typing: search results and messages are now triggered when users stop typing
- clarifies the Remove button title attribute
- removes a couple unnecessary `preventDefault()`
Props davetgreen, afercia.
Fixes#28888.
Built from https://develop.svn.wordpress.org/trunk@44825
git-svn-id: http://core.svn.wordpress.org/trunk@44657 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The `change` event was previously required to ensure that the Customizer picked detected changes to the widget’s content and synced them to the preview. In the current state, though, the `trigger( ‘change’ )` is no longer required and is causing issues with the widget’s “Done” and “Save” buttons.
Fixes#45335.
Props audrasjb, afercia, westonruter.
Built from https://develop.svn.wordpress.org/trunk@44816
git-svn-id: http://core.svn.wordpress.org/trunk@44648 1a063a9b-81f0-0310-95a4-ce76da25c4cd
With the exception of the "Edit" link, the "row actions" controls in the Comments table behave differently depending if JavaScript support is on or off.
When JavaScript support is off, they behave like links. When JavaScript support is on, they behave like buttons and they need to be buttons or have an ARIA `role="button"` added via JavaScript.
Lastly, the buttons in the Reply/Quick Edit form and the "Add Comment" in the edit post page meta box need to be buttons.
Fixes#43412.
Built from https://develop.svn.wordpress.org/trunk@44759
git-svn-id: http://core.svn.wordpress.org/trunk@44591 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Modifies the jQuery selector for determining hidden columns to ensure they are detected when the expanded columns details are closed.
Adds high-specificity selectors specifically for setting screen options in the comments and plugins lists.
Props afercia.
Fixes#46005.
Built from https://develop.svn.wordpress.org/trunk@44722
git-svn-id: http://core.svn.wordpress.org/trunk@44553 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The `keyup` event was used to provide support for IE8, where which doesn't support the `input` event. As we dropped IE8 support some time ago, this was simply adding unnecessary complexity and double-event triggers.
Props dlh, afercia.
Fixes#32882.
Built from https://develop.svn.wordpress.org/trunk@44539
git-svn-id: http://core.svn.wordpress.org/trunk@44370 1a063a9b-81f0-0310-95a4-ce76da25c4cd
An integer comparison is performed against `control.currentErrorAnnotations`, but `control.currentErrorAnnotations` is actually an array. This fixes that comparison so the content saves correctly.
Props barryceelen.
Fixes#43657.
Built from https://develop.svn.wordpress.org/trunk@44474
git-svn-id: http://core.svn.wordpress.org/trunk@44305 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In the Customizer a notice will show up if there is at least one registered sidebar with its section not being active. In order to achieve that, the count of registered sidebars is compared to the count of active sections in the Widgets panel. Prior to this change, the latter would incorrectly include any sections, even additional sections that do not correspond to a sidebar.
Fixes#43556.
Built from https://develop.svn.wordpress.org/trunk@43588
git-svn-id: http://core.svn.wordpress.org/trunk@43417 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Many variables in the JavaScript were defined in the global scope without being explicitly assigned to the window. When built with Webpack, the code gets encapsulated in anonymous functions and those implicit globals get assigned to the wrong scope. This patch prevents that from happening.
Fixes#44371. See #43731.
Built from https://develop.svn.wordpress.org/trunk@43577
git-svn-id: http://core.svn.wordpress.org/trunk@43406 1a063a9b-81f0-0310-95a4-ce76da25c4cd
These annotations make it clear to the reader of a JavaScript source
where the build process outputs to. These annotations can later be
integrated in a webpack configuration. This way there is one source of
truth.
The `build` folder is omitted from the paths, because a single JS file
shouldn't not be responsible of knowing where outputs in general will
end up at. A file only knows its output location relative to the
project.
Props adamsilverstein, herregroen, omarreiss, pento.
Fixes#44361.
Built from https://develop.svn.wordpress.org/trunk@43347
git-svn-id: http://core.svn.wordpress.org/trunk@43175 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- really disables buttons when they look disabled (when navigation is at the first or last theme)
- when navigation is at the first or last theme, moves focus to the other navigation button, to avoid a focus loss
- improves the buttons visually hidden accessibility text
Props walbo, afercia.
Fixes#36627.
Built from https://develop.svn.wordpress.org/trunk@43020
git-svn-id: http://core.svn.wordpress.org/trunk@42849 1a063a9b-81f0-0310-95a4-ce76da25c4cd
For a number of years, the "Available Widgets" section has been off-limits for
keyboard users. Now it can be used also with the keyboard. This change introduces
also some improvements for assistive technologies.
- makes the widget toggles focusable and adds an `aria-expanded` attribute to indicate their state
- improves the toggles labelling to clarify context (add/edit)
- changes the controls to choose a sidebar from list items to buttons
- adds an `aria-label` attribute to the buttons to clarify their purpose
- adds an `aria-pressed` attribute to the buttons to indicate which one is selected
- improves color contrast of the selected button
- uses a `wp.a11y.speak()` message to announce to screen reader users when a widget has been added to a sidebar
- moves focus back to the toggle button when closing a widget
See #40677.
Built from https://develop.svn.wordpress.org/trunk@42794
git-svn-id: http://core.svn.wordpress.org/trunk@42624 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Trigger a keyup event when clearing the search field in response to closing the add item panel. The keyup event triggers a search and resets the results. Previously, the search field was cleared while the potentially blank search results were left in place making it impossible to select new menu items.
Props Blair jersyer, aranwer104, afercia.
Fixes#43333.
Built from https://develop.svn.wordpress.org/trunk@42744
git-svn-id: http://core.svn.wordpress.org/trunk@42574 1a063a9b-81f0-0310-95a4-ce76da25c4cd
For better accessibility and semantics, user interface controls that perform an
action should be buttons. Links should exclusively be used for navigation. Also,
adds an `aria-expanded` attribute to the button to communicate to assistive
technologies the expanded / collapsed status of the Quick Edit form.
Props Cheffheid, audrasjb, afercia.
Fixes#38677.
Built from https://develop.svn.wordpress.org/trunk@42725
git-svn-id: http://core.svn.wordpress.org/trunk@42555 1a063a9b-81f0-0310-95a4-ce76da25c4cd
While intended as a playful error message, `Cheatin’ uh?` can be interpreted as insulting or accusatory in an already stressful situation. This replaces Cheatin’ with more meaningful error messages, depending on the error that occurs.
Props ElectricFeet, EricMeyer, karmatosed, dd32, BandonRandon, melchoyce for language; dmsnell for original patch; peterwilsoncc.
Fixes#38332.
Built from https://develop.svn.wordpress.org/trunk@42648
git-svn-id: http://core.svn.wordpress.org/trunk@42477 1a063a9b-81f0-0310-95a4-ce76da25c4cd
As decided in the JavaScript core chat. With a few reasons:
* It is visually cleaner when reading the source.
* This bring the JavaScript documentation closer to the PHP documentation.
The only disadvantage is that the JSDoc parser doesn't split out the summary and the description in the new format. We've decided to solve this when building the JavaScript documentation parser.
Props herregroen.
Fixes#42901.
Built from https://develop.svn.wordpress.org/trunk@42411
git-svn-id: http://core.svn.wordpress.org/trunk@42240 1a063a9b-81f0-0310-95a4-ce76da25c4cd
On the "Attachment Details" screen:
* The crop button is always 'enabled'.
* Clicking the crop button with no selection selects the entire image.
* Clicking the crop button with the entire image selected doesn't do anything.
* Clicking the crop button with a selection crops as expected.
Props sonjanyc, afercia, mikeschroder.
Fixes#30155.
Built from https://develop.svn.wordpress.org/trunk@42404
git-svn-id: http://core.svn.wordpress.org/trunk@42233 1a063a9b-81f0-0310-95a4-ce76da25c4cd
JSDoc takes it structural data from `@namespace`, `@lends` and `@memberOf`. This change fixes these tags for all JavaScript files in the wp-admin folder.
* Add jsdoc configuration to parse wp-admin/js files. Use `jsdoc -c jsdoc.conf.json` to generate JSDoc.
* Define all used namespaces using `@namespace`.
* Define each usage of the extend function as a prototype assignment using `@lends`.
* Add `@alias` if JSDoc cannot detect the correct name automatically.
This has previously been corrected for all `wp-includes` JavaScript files: [41351].
Props herregroen.
Fixes#42485.
Built from https://develop.svn.wordpress.org/trunk@42403
git-svn-id: http://core.svn.wordpress.org/trunk@42232 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The `custom-header.js` file is only used on the `wp-admin/themes.php?page=custom-header` page. As that page is no longer linked from the UI the functions in the file are marked deprecated.
Props nicollle, jipmoors, diedeexterkate.
Fixes#42678.
Built from https://develop.svn.wordpress.org/trunk@42385
git-svn-id: http://core.svn.wordpress.org/trunk@42214 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- When switching to the Text view, wait until after the Visual editor element has been hidden, before focussing the `<textarea>`.
- When switching to the Visual view, only scroll if the cursor is not visible on the current screen.
Fixes#42530.
Built from https://develop.svn.wordpress.org/trunk@42175
git-svn-id: http://core.svn.wordpress.org/trunk@42005 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Simplify regular expression for checking URL validity to just do basic checks to confirm the value looks like a URL. Leave the complete validation to the server-side logic in `WP_Customize_Nav_Menu_Item_Setting::sanitize()` to avoid having to maintain two separate codebases for validating URLs.
Props westonruter, SergeyBiryukov for testing.
Amends [41697].
See #32816.
Fixes#42506 for trunk.
Built from https://develop.svn.wordpress.org/trunk@42153
git-svn-id: http://core.svn.wordpress.org/trunk@41984 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Consider both `selectedChangesetStatus` and `changesetStatus` states when deciding to disable.
* Factor out common logic into `canSwitchTheme` function on `ThemesPanel`.
* Keep Live Preview and Install buttons disabled in Themes controls and detail overlays when appropriate.
Props westonruter, dlh.
Amends [41788].
See #42126, #37661, #39896.
Fixes#42406.
Built from https://develop.svn.wordpress.org/trunk@42113
git-svn-id: http://core.svn.wordpress.org/trunk@41942 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Let min hour be 0 and max be 23 in 24-hour time; let min hour be 1 and max be 12 in 12-hour time.
* Show error notification when an invalid date value is provided, not just when not a future date.
* Fix translation of custom validity message.
* Start checking for validity after all inputs have been initially populated.
* Remove support for being able to enter 24:00.
* Cease forcing date input elements from being casted to integers, to allow for invalid inputs to be detected.
Props westonruter, Presskopp, peterwilsoncc, atachibana for testing.
See #39896, #28721.
Fixes#42373.
Built from https://develop.svn.wordpress.org/trunk@42042
git-svn-id: http://core.svn.wordpress.org/trunk@41876 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Passing `options.params` when constructing `Partial` is now deprecated in favor of just passing `options`.
* Improve usage of jsdoc in JS `Partial` class.
* Also add `defaults` property to `wp.customize.selectiveRefresh.Partial` class for parity with `Control`.
See #42083.
Built from https://develop.svn.wordpress.org/trunk@42037
git-svn-id: http://core.svn.wordpress.org/trunk@41871 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Deprecate PHP classes `WP_Customize_New_Menu_Section` and `WP_Customize_New_Menu_Control`.
* Deprecate JS class `wp.customize.Menus.NewMenuControl`.
* Also introduce `wp.customize.Menus.createNavMenu()` for logic to create nav menus separately from the logic for handling UI interactions.
Amends [41768].
See #40104, #42364.
Fixes#42357.
Built from https://develop.svn.wordpress.org/trunk@42034
git-svn-id: http://core.svn.wordpress.org/trunk@41868 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Expand containing panel when expanding themes section.
* Consolidate UI changes related to a section's expanded state change.
* Prevent collapsing current section when expanding.
* Auto-expand first themes section when expanding panel if one is not expanded already.
See #37661, #42354.
Fixes#42360.
Built from https://develop.svn.wordpress.org/trunk@42033
git-svn-id: http://core.svn.wordpress.org/trunk@41867 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Eliminate Media control template from having dependency on `params.settings.default` for element ID, to fix compat with `params.settings` array or single `params.setting`. See #36167.
* Move description out of label and add `aria-describedby` to Media control's Select button. See #30738, #33085.
* Obtain notification container whenever content is (re-)rendered (such as for Media control). See #38794.
* Re-render notifications after control content is re-rendered, if control is in expanded section. See #38794.
Amends [41390].
See #36167, #38794, #33085, #30738.
Built from https://develop.svn.wordpress.org/trunk@42031
git-svn-id: http://core.svn.wordpress.org/trunk@41865 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The `publish_settings` section is a fundamental dependency for Customizer, so it must be guaranteed to be registered.
Also unconditionally register core types for panels, sections, and controls in case plugin unhooks all `customize_register` actions.
See #39896.
Fixes#42337.
Built from https://develop.svn.wordpress.org/trunk@42025
git-svn-id: http://core.svn.wordpress.org/trunk@41859 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fixes issue specifically with attempting to access an orphaned control's `elements` immediately after it has been added. Normally this would not happen because a control would not be registered without a section, and also a control should only be interacted with once its `embedded` deferred has been resolved.
Also harden logic for gathering list of deferred setting IDs.
See #37964.
Fixes#42330.
Built from https://develop.svn.wordpress.org/trunk@42024
git-svn-id: http://core.svn.wordpress.org/trunk@41858 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Reverting this for 4.9. It will be added back in a future version of WordPress. This doesn't mean that you shouldn't be trying Gutenberg, just that it isn't ready for a call out to a larger audience. But if you are the type to read commit messages, https://github.com/WordPress/gutenberg could use your pull requests and comments on issues.
Reverts [41931] [41900] [41896] [41895]
See #41316
Built from https://develop.svn.wordpress.org/trunk@41978
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Update the `CodeEditorControl`'s `codemirror` deferred to be set before calling the parent class's `initialize` method. Since the `ready` method may be called directly by `initialize` it may be too late to add a new `Deferred` to the control's `deferred` property after calling the base control class's `initialize`.
Amends [41958].
See #41897.
Built from https://develop.svn.wordpress.org/trunk@41960
git-svn-id: http://core.svn.wordpress.org/trunk@41794 1a063a9b-81f0-0310-95a4-ce76da25c4cd
CodeMirror gets initialized once the control's containing section is expanded. The deferred will be rejected if user preference for syntax highlighting is disabled.
Also move jsdoc from `wp.customize.Control` to intended `wp.customize.Control#initialize()`.
See #41897, #12423.
Built from https://develop.svn.wordpress.org/trunk@41958
git-svn-id: http://core.svn.wordpress.org/trunk@41792 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow `CodeEditorControl` to be instantiated with a `editor_settings` param which is merged with `wp.codeEditor.defaultSettings`.
Also:
* Turn redundant "CSS Code" control label into screen reader text for Additional CSS.
* Remove `code-editor` as script dependency for `custom-html-widgets` since enqueueing is determined by `wp_enqueue_code_editor()`.
* Remove useless exporting of `code_type` param to JS in `WP_Customize_Code_Editor_Control`.
* Add `disabled` class to Custom HTML widget's Save button when linting errors are present.
* Remove redundant `span` inside CodeEditorControl's `label`.
See #41897, #12423, #41872.
Built from https://develop.svn.wordpress.org/trunk@41957
git-svn-id: http://core.svn.wordpress.org/trunk@41791 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Introduce a `widget_{$id_base}_instance_schema` filter for plugins to add new properties to a media widget's instance schema.
* Pass all of a gallery widget's instance props to the gallery media frame, not just the ones that core supports.
See #32417, #41914.
Fixes#42285.
Built from https://develop.svn.wordpress.org/trunk@41951
git-svn-id: http://core.svn.wordpress.org/trunk@41785 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Only use default control content template when a more specific template doesn't exist.
* Remove extraneous whitespace from being output in `WP_Customize_Control::render()` method.
* Move Custom Header template printing to `customize_controls_print_footer_scripts` action.
See #30738.
Built from https://develop.svn.wordpress.org/trunk@41935
git-svn-id: http://core.svn.wordpress.org/trunk@41769 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Update deprecated `isHostedVideo` method to always return `true` since all oEmbeds are now supported.
* Disable `scanImage` for non-image media widgets.
* Ensure embed URL field element is matched from current media frame instance due to bug where media frames are not destroyed upon closing.
* Update error message for invalid video URLs to ask user to check the URL for validity.
Props gk.loveweb, octalmage, westonruter.
See #42039, #40935.
Fixes#41052.
Built from https://develop.svn.wordpress.org/trunk@41933
git-svn-id: http://core.svn.wordpress.org/trunk@41767 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Update stubs to have draft status when changeset is saved as draft, instead of preventing auto-draft garbage collection by giving them a far-future `post_date`.
* Show notice in publish metabox when editing a customization draft indicating that it will be published automatically with its changeset; a link to Customizer is included.
* Include a new "Customization Draft" display post state in the post list table.
* Disconnect stubs from their changesets when they are updated with a status other than "Draft".
* Trash customization drafts when their related changeset is trashed or deleted.
* Add a `_customize_changeset_uuid` postmeta to stubs to link them with their associated changeset.
* Include `customize_changeset_uuid` as context when requesting to insert a new auto-draft.
Props westonruter, melchoyce.
See #39896, #39752, #34923.
Fixes#42220.
Built from https://develop.svn.wordpress.org/trunk@41887
git-svn-id: http://core.svn.wordpress.org/trunk@41721 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The warning displayed upon first visit on the File Editors introduced in [41774]
needs to be the only perceivable content in the page for users of assistive
technologies. It looks like a modal but it's not exactly an ARIA dialog, not an
ARIA alert either, and needs some special treatment.
- constrains tabbing within the modal
- uses `wp.a11y.speak()` to make screen readers announce the modal message
- hides all the other page content from assistive technologies using `aria-hidden="true"`
This way, even if users miss the speak message, the warning is actually the only
perceivable content in the page.
Fixes#42110.
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