[TYPO3-core] FYI: Fixed bug #10844: htmlArea RTE: htmlArea RTE: undo/redo is erratic in IE8

[Stanislas Rolland]

FYI: The attached SVN patch was committed.

Type:
Bugfix

Problem:
Problems arise in IE8 when an attempt is made to insert a bookmark, the 
selection is empty and focus is not in the editing iframe.

Such bookmarks are used to restore the cursor position when undo/redo 
operations are performed. Inserting a bookmark requires the creation of 
a range. Because of the IE8 bug(feature?), the created range is incorrect.

If focus is brought on the editor iframe for the purpose of inserting a 
bookmark, any opened dialogue window is minimized, which is very 
annoying, since undo/redo snapshots are taken asynchronously.

Similar problems arise when a special character is inserted (because 
inserting the character requires creation of a range) or when the 
acronym dialogue window opens (because it may need to create a range to 
get the current acronym/abbreviation).

Solution:
Avoid inserting bookmarks when a dialogue window is opened and the 
selection is empty. The impact is minimal, but it could happen that 
cursor position is not restored on undo/redo operations. This will be 
hard to fix when Microsoft corrects the bug, because it is not clear how 
  the script can detect that the bug exists or not...

In the case of acronyms, move code so that the current acronym, if any, 
is located before opening the dialogue window.

The issue does not exist in TYPO3 4.1 because the cursor position 
restoration feature is not available in that branch and acronym was not 
enabled in IE in that branch either.

Bugtracker references:
http://bugs.typo3.org/view.php?id=10847
http://bugs.typo3.org/view.php?id=10844

Branches:
trunk (revision 5306)
typo3_4-2 (revision 5305)

Regards,
Stanislas
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