[TYPO3-core] RFC: #14404: Preview of mount pages with workspaces

[Georg Ringer]

This is an SVN patch request.

Type: bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=14404

Branches:
trunk & TYPO3_4-3

Problem:
If mount pages are used within versioned records it is not possible to
create a preview in the module "View" and with using the clickmenu.

How to test:
- Switch to a workspace (for example the Default Draft Workspace)
- Create a new page, set the type to Mount page and fill in the mount
page infos + Save
- Switch to the BE module "View" and try to get a preview of the page.
- Use the Clickmenu entry "Show"

Both test cases will fail before the patch and will show the the mounted
page after applying the patch.

Solution:
Get the mountpoint info from the workspace record and not from the
original page which can be just a placeholder.

Additional information:
This patch is related to following RFCs which have been commited already:
- #13554: Preview of mount pages via backend
- #13739: "Show" clickmenu in page tree does not work for mount pages

Those patches introduced the possibility for previews of mount pages but
didn't consider the versioned records.

Georg
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