[TYPO3-core] RFC #4270 displayCond for flexforms, that affects on row of element

[Tolleiv Nietsch]

Hi,
this is a SVN patch request.

Type: Feature

Bugtracker references:
http://bugs.typo3.org/view.php?id=4270

Branches: Trunk

Problems:
TCEform display conditions can't reference their parent-records's values

Solution:
comparable to the templavoila parentRec-registers this patch provides a 
way to reference these values via parentRec.<fieldname> within the 
flexform-displayCond fields

Notes:
Could be very helpful to improve UX for flexform-users. As soon as TYPO3 
has PHP 5.3 as dependency this should be improved by using a lambda 
function instead of create_function(...)

Example:
check whether the header-field within the parent record has a value:
<displayCond>FIELD:parentRec.header:REQ:true</displayCond>

Regards,
Tolleiv
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