Merge topic 'fixPopUpWindowBug2'

2040ca5c Sanitize some OpenGL rendering classes
52db68e9 Fix pop up layout with tone mapping crash

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Lucas Givord <lucas.givord@kitware.com>
Reviewed-by: Lucas Gandel <lucas.gandel@kitware.com>
Reviewed-by: Sankhesh Jhaveri <sankhesh.jhaveri@kitware.com>
Merge-request: !10697