[TYPO3-core] RFC #11087: TCEForm does not replace the existing element if adding a new element to a field with maxitems=1

[Benjamin Mack]

Hey devs,

this is a SVN patch request.

Type: bugfix

Branches: trunk

BT reference: http://bugs.typo3.org/view.php?id=11087

Problem:
If you want to change a select-field in TCEforms with only one item 
(like the Storage Folder) where there is only one item allowed.

Steps to reproduce:
* Edit the page properties
* Select a page for a "storage folder" from the element browser
* Select another item from the element browser, you'll get an error 
because there are no two items in the list (although you only see one).
* Once you want to remove the first element, both are gone and you have 
to open up the element browser again

With this patch the second value replaces the first one when only one is 
allowed (maxItems).

All the best,
Benni.