* Code editor is integrated into the Theme/Plugin Editor, Additional CSS in Customizer, and Custom HTML widget. Code editor is not yet integrated into the post editor, and it may not be until accessibility concerns are addressed.
* The CodeMirror component in the Custom HTML widget is integrated in a similar way to TinyMCE being integrated into the Text widget, adopting the same approach for integrating dynamic JavaScript-initialized fields.
* Linting is performed for JS, CSS, HTML, and JSON via JSHint, CSSLint, HTMLHint, and JSONLint respectively. Linting is not yet supported for PHP.
* When user lacks `unfiltered_html` the capability, the Custom HTML widget will report any Kses-invalid elements and attributes as errors via a custom Kses rule for HTMLHint.
* When linting errors are detected, the user will be prevented from saving the code until the errors are fixed, reducing instances of broken websites.
* The placeholder value is removed from Custom CSS in favor of a fleshed-out section description which now auto-expands when the CSS field is empty. See #39892.
* The CodeMirror library is included as `wp.CodeMirror` to prevent conflicts with any existing `CodeMirror` global.
* An `wp.codeEditor.initialize()` API in JS is provided to convert a `textarea` into CodeMirror, with a `wp_enqueue_code_editor()` function in PHP to manage enqueueing the assets and settings needed to edit a given type of code.
* A user preference is added to manage whether or not "syntax highlighting" is enabled. The feature is opt-out, being enabled by default.
* Allowed file extensions in the theme and plugin editors have been updated to include formats which CodeMirror has modes for: `conf`, `css`, `diff`, `patch`, `html`, `htm`, `http`, `js`, `json`, `jsx`, `less`, `md`, `php`, `phtml`, `php3`, `php4`, `php5`, `php7`, `phps`, `scss`, `sass`, `sh`, `bash`, `sql`, `svg`, `xml`, `yml`, `yaml`, `txt`.
Props westonruter, georgestephanis, obenland, melchoyce, pixolin, mizejewski, michelleweber, afercia, grahamarmfield, samikeijonen, rianrietveld, iseulde.
See #38707.
Fixes#12423, #39892.
git-svn-id: https://develop.svn.wordpress.org/trunk@41376 602fd350-edb4-49c9-b593-d223f7449a82
The same styling from the Text widget should apply to the Custom HTML widget since users are expected to copy HTML from the (legacy) Text widget into the latter.
Amends [40893].
See #40907.
Fixes#41392.
git-svn-id: https://develop.svn.wordpress.org/trunk@41115 602fd350-edb4-49c9-b593-d223f7449a82
Ensures that users who copy HTML from the Text widget in legacy mode over to the Custom HTML widget will continue to get all of the same filters applied, including tag balancing and shortcodes, if a plugin added support. Plugins still have the `widget_text_content` and `widget_custom_html_content` filters they can use to target the specific widget types.
Amends [40893].
See #40951.
Fixes#40907 for trunk.
git-svn-id: https://develop.svn.wordpress.org/trunk@41086 602fd350-edb4-49c9-b593-d223f7449a82
Also update `WP_Customize_Widgets::$core_widget_id_bases` with the new list of core widgets.
Props obenland, westonruter.
See #40907, #40951.
git-svn-id: https://develop.svn.wordpress.org/trunk@41000 602fd350-edb4-49c9-b593-d223f7449a82
Correspondingly renames files, ID base from `html_code` to `custom_html`, and the filter from `widget_html_code_content` to `widget_custom_html_content`.
See #40907.
git-svn-id: https://develop.svn.wordpress.org/trunk@40926 602fd350-edb4-49c9-b593-d223f7449a82
