Converts a <p> node containing <br>'s into multiple <p> nodes.
See singleLinePsToRegularPs(). This method does the
opposite thing, and is used as a pre-filter when loading the
editor, to mirror the effects of the post-filter at end of edit.
Change state of the plugin to respond to events in the editor.
This is called on meaningful events in the editor, such as change of selection
or caret position (but not simple typing of alphanumeric keys). It gives the
plugin a chance to update the CSS of its button.
For example, the "bold" plugin will highlight/unhighlight the bold button depending on whether the
characters next to the caret are bold or not.
Only makes sense when `useDefaultCommand` is true, as it calls Editor.queryCommandEnabled(`command`).
This property decides the behavior of Enter key. It can be either P,
DIV, BR, or empty (which means disable this feature). Anything else
will trigger errors.
See class description for more details.
String like "insertUnorderedList", "outdent", "justifyCenter", etc. that represents an editor command.
Passed to editor.execCommand() if useDefaultCommand is true.