[TYPO3-core] RFC #14793: htmlArea RTE: Problematic icons in IE6

[Stanislas Rolland]

This is a SVN patch request.

Type:
Bugfix

Problem:
The button icons in the RTE toolbar do not look good in IE6.
They have a black border and a blue background coming from God knows 
where! The same icons also have this bluish background in the context 
menu and in the header of dialogue windows.

Solution:
The attached patch:
1. sets the border colour to the colour of the background when in IE6 
(and probably also in IE7);
2. adds some selectors to class tx_templatehook in t3skin/pngfix so that 
the icons of the toolbar and of the dialogue window headers are 
processed by the pngfix script.

As a result, the icons look fine in the toolbar. They just disappeared 
from window headers, but that is ok for me for IE6.

If tried applying the same procedure to the icons in the context menu: 
the bluish background disappears, but the background-position is lost, 
so that only the same first icon of the sprite image is always shown. It 
is not obvious to me how to get these icons processed by the 
iecompatibility script, therefore I left them with their blue background...

Bugtracker references:
http://bugs.typo3.org/view.php?id=14793

Branches:
trunk

Regards,
Stanislas
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