Fullscreen 21:9 aspect ratio offsets mouse cursor from UMG
When applying a 21:9 resolution in fullscreen, UMG buttons and mouse position will no longer match up. This makes it very difficult to interact with UMG elements
Steps to reproduce:
Other resolutions like 1280x600 works fine, but when going down step by step to 1280x580, 1280x560 and so on, the hitbox area gets more and more shifted in fullscreen mode.
It also offsets on 1280x620, x640 and x660. But 1280x680 works fine. (On a 1920x1080 monitor)
Windowed modes works fine.
Some monitors appears on the market now with 21:9 2560x1080 resolution. Trying that resolution on a 4k screen, the widget hitboxes offset way out up to the right.
I do not have an actual 21:9 monitor to test on. (I was given this bug by a marketplace customer)
I have attached a sample project with a simple UMG to change resolution. link text
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