* 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.
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* Used now in core to facilitate displaying inserted media. See #40854.
* The `[embed]` shortcode is not supported because there is no post context for caching oEmbed responses. This depends on #34115.
* Add `do_shortcode()` to the `widget_text_content` filter in the same way it is added for `the_content` at priority 11, with `shortcode_unautop()` called at priority 10 after `wpautop()`.
* For Text widget in legacy mode, manually apply `do_shortcode()` (and `shortcode_unautop()` if auto-paragraph checked) if the core-added `widget_text_content` filter remains, unless a plugin added `do_shortcode()` to `widget_text` to prevent applying shortcodes twice.
* Ensure that global `$post` is `null` while filters apply in the Text widget so shortcode handlers won't run with unexpected contexts.
Props westonruter, nacin, aaroncampbell.
See #40854, #34115.
Fixes#10457.
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Prior to about 2013, many class methods lacked even access modifiers which made the `@access` notations that much more useful. Now that we've gotten to a point where the codebase is more mature from a maintenance perspective and we can finally remove these notations. Notable exceptions to this change include standalone functions notated as private as well as some classes still considered to represent "private" APIs.
See #41452.
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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.
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Since plugin-added shortcode handling is just-in-time deferred to run after `wpautop`, there is no need to retain the presence of shortcodes to trigger legacy mode. Also updates Text widget legacy mode notice informing of Custom HTML widget.
Amends [41050].
Props westonruter, melchoyce.
Fixes#40951 for trunk.
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The Text widget in legacy mode omits TinyMCE and retains old behavior for matching pre-existing Text widgets. Usage pointers added to default visual mode appear when attempting to paste HTML code into the Visual tab and when clicking on the Text tab, informing users of the new Custom HTML widget.
Props westonruter, melchoyce, gitlost for testing, obenland for testing, dougal for testing, afercia for testing.
See #35243.
Fixes#40951.
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* Introduces `customize-selective-refresh-widgets` theme support feature and adds to themes.
* Introduces `customize_selective_refresh` arg for `WP_Widget::$widget_options` and adds to all core widgets.
* Remove `selective_refresh` from being a component that can be removed via `customize_loaded_components` filter.
* Add `WP_Customize_Widgets::get_selective_refreshable_widgets()` and `WP_Customize_Widgets::is_widget_selective_refreshable()`.
* Fix default `selector` for `Partial` instances.
* Implement and improve Masronry sidebar refresh logic in Twenty Thirteen and Twenty Fourteen, including preservation of initial widget position after refresh.
* Re-initialize ME.js when refreshing `Twenty_Fourteen_Ephemera_Widget`.
See #27355.
Fixes#35855.
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Ensures that intentional backslashes (e.g. "\o/") can be used in:
* Site title
* Site description
* Nav menu name
* Custom Menu widget title
* Tag Cloud widget title
* Text widget body if can't `unfiltered_html`
The latter three are also fixed on the widgets admin page.
Fixes#35898.
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* `default-widgets.php` now requires all of the individual classes
* Move the functions scattered about this file to `widget-functions.php`, which loads before `default-widgets.php`, which only conditionally loads anyway in `wp_maybe_load_widgets()`, which is hooked on `plugins_loaded`
See #33413, #23012.
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