[TYPO3-core] FYI: Fixed bug #7958: htmlArea RTE undo/redo handler may cause errors in FF

[Stanislas Rolland]

FYI: The attached SVN patch was committed.

Type:
Bugfix

Problem:
In FF, recurrent JS errors may be raised by the undo/redo handler when 
the RTE becomes hidden behind a tab or, more generally, when the 
selection object does not contain any usable range.

Solution:
Catch the error.

Bugtracker references:
http://bugs.typo3.org/view.php?id=7958

Branches:
TYPO3_4-2

Regards,
Stanislas
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