Alt-Tab and gamma settings
Many alt-tab issues have been reported but this one may not:
When using alt-tab to come back to the desktop, and then returning to openmw, gamma settings are cancelled. Need to go back to video settings, to sightly move the gamma settings slide, so the settings are restored.
(RM-2958 from redmine: created on 2015-10-05 by Mordicus Mordicus, , duplicates #4265 (closed))