this currently disables thumbnail even on set_visible(true)
calls which was causing flickering due when scrubbing through
the timeline. only disable thumbnail when hiding the osc.
Fixes: 9ce79bcaa
this currently disables thumbnail even on set_visible(true)
calls which was causing flickering due when scrubbing through
the timeline. only disable thumbnail when hiding the osc.
Fixes: 9ce79bcaa