In WordPress 4.6 TinyMCE is upgraded from version 4.3.10 to 4.4.1. There are numerous bug A bug is an error or unexpected result. Performance improvements, code optimization, and are considered enhancements, not defects. After feature freeze, only bugs are dealt with, with regressions (adverse changes from the previous version) being the highest priority. fixes and several new features, most notably a new inline theme (changelog).
wpview editor plugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party (that is responsible for showing gallery, video, audio, and oEmbed previews) was updated to use the TinyMCE API An API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways. for non-editable elements. This brought some small changes and improvements in the UI User interface, for example “views” are draggable now. On the back-end the
wp-mce-view-unbind event was removed as it doesn’t exist in the API. It was intended for cleanup/unloading but was never very reliable. If a plugin needs to unload instance dependent scripts, it can use mutation observer to monitor when the view node is deleted. See #36434 for more information.
wpview remains an experimental API, though with each iteration it is getting closer to being finalized. As an experimental API, breaking changes are expected. As always, please test your plugin now if it modifies or depends on the editor, especially if you use experimental features like