Photo mode in ultrawide has bug

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I run the game in 3440x1440, and when I play with the photo mode, something weird happens.
While the sliders appear at the right side of the screen, and the mouse pointer goes there, I can't get the sliders to work once i leave the 16:9 area.
Its like some part of the code works thinking I'm in a 16:9 screen and not in a 21:9 screen. (I can move the sliders using the keyboard, though).
 
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