Breaking: #77765 - ExtJS notifications and dialogs removed

See Issue #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