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Check files if they are image files before thumbnail generation. Change-Id: I7dae2ccbb5ab93e582d21efe8f7d29cf7006a1c3 Resolves: #81147 Releases: master, 8.7 Reviewed-on: https://review.typo3.org/53107 Reviewed-by: Jo Hasenau <info@cybercraft.de> Tested-by: Jo Hasenau <info@cybercraft.de> Tested-by: TYPO3com <no-reply@typo3.com> Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch> Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
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