Extend Inline editing
 PREREQUISITES: Inline editing works only for MVC widgets and pages. It is not available for the decoupled renderers - ASP.NET and Next.js.
LongText field uses KendoUI Editor. You can customize the editor's tools by performing the following:
    - In your project, create a JavaScript file and call it LongText.js
 
    - Inside the new file, paste the following: 
    
    
    
    In the code above, you also customize the configuration tools. For more information, see Kendo UI Configuration tools. 
    - From your custom file, add a new VirtualPath that helps Sitefinity CMS resolve the requested LongText.js. To do this, in your ~App_Data/Sitefinity/Configuration/VirtualPathSettingsConfig.config file, as a last line inside the <virtualPaths>...</virtualPaths> section, add the following:
    <add resourceLocation="~/<file_path>/LongText.js" resolverName="Embedded" resolverType="Telerik.Sitefinity.Abstractions.VirtualPath.FileSystemResolver, Telerik.Sitefinity" virtualPath="~/Res/Telerik.Sitefinity.Web.UI.PublicControls.InlineEditing.EditableControls.Scripts.LongText.js" />
    Replace the ~/<file_path>/LongText.js, highlighted above, with the relative path to your custom LongText.js file you created in Step 1. 
    - Save all modified files and restart the application.
    Inline editing starts using your custom JavaScript file.