[TYPO3-core] FYI: Fixed bug #7690: Firefox 1.5 and Mozilla 1.7 crash when htmlArea RTE is in hidden tab

[Stanislas Rolland]

FYI: The attached SVN patch was committed.

Type:
Bugfix

Problem:
In older versions of Mozilla, ev.attrName is not yet set when the 
DOMAttrModified event handler is entered, and refering to this event 
attribute causes a non-catchable error and browser crash. We are 
assuming that this was fixed in Firefox 2.0.0.11

Solution:
Test navigator.productSub before accessing the attribute.

Bugtracker references:
http://bugs.typo3.org/view.php?id=7690

Branch:
TYPO3_4-2

Regards,
Stanislas
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