[TYPO3-core] RFC #15511: Bug: fixed some admPanel issues

[Michael Bürgi]

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=15511

Branches:
TYPO3_4-3 & TYPO3_4-4 & trunk

Problem:
This patch addresses the following problems regarding the TS configuration of the adminPanel:

- "override.preview = 1" being required to activate the preview if the adminPanel is hidden. Unfortunately this undocumented setting turns on all preview settings.

- override.* settings can only override if they evaluate to true. This means that you could never turn features off, only on: e.g. override.preview.showHiddenPages = 0 is ignored!

The combination of both problems make it nearly impossible to configure the adminPanel for certain configurations. see bug tracker for more information.

Solution:
- "override.preview = 1" is no longer required to activate the preview if the adminPanel is hidden.
- The patch enables override.* settings to override even if they evaluate to false (used for turning features off e.g.)


Notes:
I've put quite a lot of time into this issue. Please have a look at it. The Bug tracker issue contains some additional problems which are not addressed by this patch.

Kind regards
Michael Buergi
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