* Keyboard shortcuts work when CodeMirror is not enabled (due to syntax highlighting not being enabled), and when the user is not focused inside the CodeMirror editor.
* The autocomplete trigger is switched from `keyup` to `inputRead` to improve reliability, support IME composition, and prevent conflicts with modifier keys (e.g., releasing `Ctrl`/`Cmd` before `s` after a save).
* A `updateErrorNotice` method is exposed on the code editor instance to ensure validation errors are displayed when a save via shortcut is attempted, preventing "silent" failures. Otherwise, the linting error notice is only shown when focus leaves the editor.
* The form submission is modernized by replacing the deprecated jQuery `.submit()` shorthand with `.trigger( 'submit' )`.
Developed in https://github.com/WordPress/wordpress-develop/pull/10851
Props westonruter, Junaidkbr, evansolomon, desrosj, mukesh27, jonsurrell, spiraltee, chexee, andrewryno, tusharaddweb, gauri87, huzaifaalmesbah, ocean90, karmatosed, johnbillion, scribu, jcnetsys.
Fixes#17133.
Built from https://develop.svn.wordpress.org/trunk@61588
git-svn-id: http://core.svn.wordpress.org/trunk@60899 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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