TYPO3 Core

In Internet Explorer, all select boxes are displayed above all other
HTML elements on the page. This bug is well-known and described here:
http://support.microsoft.com/?id=177378
Unfortunately, when using a layermenu in TYPO3, as we do on our site,
there are some serious displaying errors because not all items can be
accessed easily. Please see the attached screenshots what the problem is
like.

Proposed Fix:
The only solution to this problem seems to be to hide the select boxes
temporarily if they are under the layermenu.
To implement this in a general manner, one would have to find out all
the positions of all dropdown select boxes first (the problem only
occurs there, not with other form elements [see MSDN]). After
finding out the positions of the select elements, they could be hidden
as needed in case they are overlapping with a layermenu.

In general, this solution needs quite some JS calculations, and that's
why I think it needs to be made possible to switch the bugfix on or off.

We would implement the solution outlined above and provide a fix for
this. It would be nice if the solution could - if workable - go into the
TYPO3 core.

Greets,
Sebastian Kurfuerst

(issue imported from #M1431)