[TYPO3-core] FYI: Fixed bug #7851: htmlArea RTE causes memory leaks in IE

[Stanislas Rolland]

FYI: The attached SVN patch was committed.

Type:
Bugfix

Problem:
IE7 fails to collect some 1.3 meg of garbage on each unload. Moreover, 
when one of the word cleaning plugins is enabled (DefaultClean or 
TYPO3HtmlParser), memory leakage of 4 to 5 megs may be experienced in IE7.

Solution:
Fix the event releasing sequence, and remove closure from word cleaning 
plugins causing serious problem to IE7 garbage collection.

Note:
After appying the patch, memory leakage, if any, is insignifiacnt in 
IE7, FF2, FF3, Opera9.5. For unknown reasons, significant leakage 
remains in Safari3, but there is important leakage in Safari even when 
the RTE is not activated.

Bugtracker references:
http://bugs.typo3.org/view.php?id=7851
http://bugs.typo3.org/view.php?id=5154

Branches:
TYPO3_4-2

Regards,
Stanislas
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