[TYPO3-core] RFC #13750: Bug: Several GIFBUILDER features broken for IM4, IM6 and GM

[Joerg Wagner [DigiLog]]

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=13750

Branches:
TYPO3_4-3 & trunk
TYPO3_4-2 & trunk

Problem:
When IM4, IM6 or GM are used, several GIFBUILDER features that 
internally use mask images (e.g. SHADOW and NICETEXT) are broken.
The reason is a flawed processing of quoted subparts in IM commands. 
This flaw probably has many more side effects!

Solution:
When testing substrings for leading quotes, function 
t3lib_div::unQuoteFilenames() may only go into "start quote found" mode 
if the substring does not also contain a trailing quote. This is done by 
a simple change of the regular expression used to detect leading quotes.

A more detailed explanation of the problem and its solution can be found 
in the bugtracker posting.
Cheers, Jörg.

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