TYPO3 Core

I've got several editors that are limited to a certain subtree of the website. Every editor is 'locked' in the same custom workspace - so that they can't mess things up in live version.

Every subtree has the following access settings:
- owner: all rights
- group: all rights
- all: no rights - not even viewing

Now, when a editor is moving a page in his subtree, the page finally disappears in the pagetree. As admin I still can see the page and the WS-Placeholder created for it, but the placeholder has no access configuration at all - thus it's disallowed for all users. By setting the placeholers access rights, the editors finally can see the moved page in the workspace pagetree again.

In pageTS I defined a default usergroup and access-settings to use for new pages - but they don't get used for the WS-placeholder. Also TCAdefaults didn't work.
But the placeholder should have the same access settings as it's related page and not fall back to some default value anyway.

So I digged the source and found a solution that's working for me. Hope it's fixed in the right place and the correct way.

(issue imported from #M9705)