OpenMW not correctly setting GL_VIEWPORT
I guess OpenMW is not correctly setting GL_VIEWPORT. The consequences are seen when I use an OpenGL HUD, like MangoHud, along with OpenMW. Here is a screenshot showing the effect:
Here, I've set MangoHud to open in the top-right corner of the screen. However, it's shown in the middle-left. I raised this issue first in MangoHud's repo here. The developer pointed out that OpenMW is setting GL_VIEWPORT to 800x600.