Shortcut to first sub-page with move placeholder does not work
#1301648167: The requested page didn't have a proper connection to the tree-root!
* Shortcut-Page * First * Second
* Shortcut-Page * [Move placeholder of "First"] * Second * First
[BUGFIX] Shortcut to first sub-page with move placeholder does not work
Shortcuts to the first sub-page with that one being moved in a workspace
lead to an exception in previewing in a workspace context. Reason is that
the move-placeholder of the valid target in the live workspace is being
disabled in a workspace which is not checked further.
Reviewed-by: Oliver Hader <email@example.com>
Tested-by: Oliver Hader <firstname.lastname@example.org>