[TYPO3-core] RFC: fix bug #2226

[Michael Stucki]

Hi Martin,

> This is a CVS patch request. It introduces a new feature although there is
> feature freeze. Please think twice :-)

I agree the feature makes sense, so ok.

> Problem: the new multi-FE group access rights have a serious UI issue.
> It's first two options are exclude any other key, but the user may select
> any combination of the keys.
> 
> Solution: Add a TCA config "exclusiveKeys" to type="select" which takes a
> comma seprated list of items keys that exclude other keys. Change the JS
> of the form handling (t3lib_tceforms) to honour this field. Change the
> form submission handling (t3lib_tcemain) to enforce it (in case the JS
> fails for some reason).

Patch comments:

- Don't forget to wrap if/else in {} brackets all the time!
- Please rename "exclValues" to "exclusiveValues" for making clean that
  these are not "excluded values".
- You forgot to add the TCA settings to make use of this change! See
  attached patch
- I didn't look at the JS code in detail. Tested it in Firefox, Opera and
  Konqueror. Please make sure it works in IE as well.

+1

Michael
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