[TYPO3-core] RFC: #9786: Remove duplicate JS-Files in backend.php

[Steffen Kamper]

Hi,

this is a SVN patch request.

Type: Bugfix

BT Reference: http://bugs.typo3.org/view.php?id=9786

Branches: Trunk

Problem:
in backend.php all JS-files are collected in an array. As this isn't an 
associative array, it's possible to add duplicated files.

Solution is simple: use array_unique before writing the script-tags

vg Steffen
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