Deprecation: #80512 - DocumentTemplate->extJScode property

See Issue #80512

Description

The property DocumentTemplate->extJScode to load ExtJS-specific code "onExtJSReady" has been marked as deprecated.

Impact

If the property is filled and added to the response output, a deprecation warning will be triggered.

Affected Installations

Any installation with custom extensions using (or mis-using) this property to inject ExtJS-specific code.

Migration

Use the PageRenderer object directly to inject addExtOnReadyCode in a backend response.