Georg Ringer authored Jan 16, 2016 and Anja Leichsenring committed Jan 16, 2016

Using ProcessedFile::CONTEXT_IMAGEPREVIEW respects the ratio and produces
nicer thumbnails.

Change-Id: I8d98dc8ff0a6883c7e03c4dddbdb6d085608904a
Resolves: #71670
Releases: master, 7.6
Reviewed-on: https://review.typo3.org/45996


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>