Prevent the thumb provider to distribute files from outside the thumbnails cache

changed milestone to %3.5.x

added Needs backport label

requested review from @Skantes

added 7 commits

• 17bac958...1e89a2a6 - 6 commits from branch videolan:master
• cbac7817 - Prevent the thumb provider to distribute files from outside the thumbnails cache

Compare with previous version

approved this merge request

enabled an automatic merge when the pipeline for cbac7817 succeeds

merged

mentioned in merge request !1664 (merged)