[TYPO3-core] RFC: Bug #15512: htmlArea RTE initialization in flexforms is broken with TYPO3 4.4

[Stanislas Rolland]

(Corrected issue # in title)

This is an SVN patch request.

Type:
Bugfix

Problem:
The initialization of htmlArea RTE fields within flexforms is broken 
when the fields are on a flexform tab that is hidden at the time of loading.

Solution:
The RTE needs to know the nested structure of tabs and inline elements 
in which it resides.

If a parent or ancestor object has the style "display: none", 
offsetWidth & offsetHeight are '0'. Therefore many sizing operations are 
wrong if the RTE is loaded in a hidden tab or inline element.

The RTE uses t3lb_tceForms::getDynNestedStack to get this structure. 
However, the flexform tabs are not registered into the DynNestedStack. 
The attached patch fixes this issue.

How to reproduce:
Thanks to Christian Kuhn, a test extension that allows to reproduce the 
issue may be found on the bugtracker issue.

Bugtracker references:
http://bugs.typo3.org/view.php?id=15512

Branches:
trunk
TYPO3_4-4

Regards,
Stanislas

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