[TYPO3-core] FYI: Fixed bug #9449: htmlArea RTE: Opera sometimes raises a JavaScript error when the RTE closes

[Stanislas Rolland]

FYI: The attached SVN patch was committed.

Type:
Bugfix

Problem:
JavaScript error is raised by Opera on unload if some dialogue window, 
usually Insert image or Insert link, was opened during the RTE session.

Solution:
Opera does not release the unload event set on the dialogue window when 
requested to do so. Workaround the error that is raised when the event 
is uselessly triggered when the RTE closes.

Bugtracker references:
http://bugs.typo3.org/view.php?id=9449

Branches:
branch TYPO3_4-2 (revision 4261)
trunk (revision 4262)

Regards,
Stanislas
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