Hide the system bar when playing video on Samsung Dex

Fixes #2930 (closed)

changed milestone to %3.6.x

added Player bug feature labels

requested review from @Skantes

approved this merge request

added 4 commits

• 73b9f0c4...b3fc8d07 - 2 commits from branch videolan:master
• 77459469 - Hide the system bar when playing video on Samsung Dex
• 8d24c2cc - Force opening the video player in fullscreen on dex

Compare with previous version

enabled an automatic merge when the pipeline for 8d24c2cc succeeds

merged