// set this after "ChangeViewportPropertiesIfNeeded()" (which may reset it)
SetDrawDeactivationMask(REDRAW_NONE);
SetDrawBackgroundMask(REDRAW_FIELD);
// set this after "ChangeViewportPropertiesIfNeeded()" (which may reset it)
SetDrawDeactivationMask(REDRAW_NONE);
SetDrawBackgroundMask(REDRAW_FIELD);