Breaking: #77765 - ExtJS notifications and dialogs removed 

See forge#77765

Description 

ExtJS notifications with the ExtJS components TYPO3.Window and TYPO3.Dialog have been removed from the TYPO3 Core.

Impact 

Calling any of the JavaScript components above will result in a JavaScript error.

Affected Installations 

Any TYPO3 installations using custom extensions based on ExtJS.

Migration 

Use the JavaScript-based Modal and Dialog functionality that are part of the TYPO3 Core since v7.

For migration details see the docs