Adds callback for custom TinyMCE editor stylesheets.
Description
The parameter $stylesheet is the name of the stylesheet, relative to the theme root. It also accepts an array of stylesheets.It is optional and defaults to 'editor-style.css'. This function automatically adds another stylesheet with -rtl prefix, e.g. editor-style-rtl.css.If that file doesn't exist, it is removed before adding the stylesheet(s) to TinyMCE.If an array of stylesheets is passed to add_editor_style(), RTL is only added for the first stylesheet. Since version 3.4 the TinyMCE body has .rtl CSS class.It is a better option to use that class and add any RTL styles to the main stylesheet.
Parameters
$stylesheetarray|stringoptional
Stylesheet name or array thereof, relative to theme root. Defaults to 'editor-style.css'Default: 'editor-style.css'
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