Breaking: #76879 - Remove unused properties from PageTreeView

See Issue #76879

Description

The following unused properties have been removed from the PageTreeView class:

ext_separateNotinmenuPages ext_alphasortNotinmenuPages

Impact

Extensions which use one of the public properties above will throw a fatal error.

Affected Installations

All installations with a 3rd party extension using one of the classes above.

Migration

No migration available.