[TYPO3-core] RFC: #9773: Fallback for skinImg having forceFileExtension

[Steffen Kamper]

Hi,

this is a SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=9773

Branches: trunk, 4_2

Problem:
The problem is visible with the icon used for insert from clipboard.

There is a icon used "insert5.png" (see insert1.png). Same icon exists 
in t3skin, but it's not shown because forceFileExtension is set to "gif"

So the function looks for insert5.gif, which doesn't exists and displays 
the one from oldskin.

Solution:
use a fallback if the icon with forceFileExtension doesn't exists and 
look for original file (insert5.png). The attached patch does this and 
fix the problem, the icon from t3skin is shown now.

vg Steffen
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