Editor becomes unresponsive after clicking off of a Widget when the input mode is set to UI only

If the user sets the input mode to UI Only and then clicks on the screen in an empty area (so that it captures the mouse) the user will no longer be able to add any input of any kind and must use the windows key to regain mouse control.

1. Open the Editor
2. Create a new widget blueprint
3. Open Widget blueprint
4. Add an image to the widget blueprint
5. Create the blueprint in the attached image
6. Compile and save
7. Play in Editor
8. Click the image
9. Notice you maintain control of input
10. Click anywhere else on screen
11. Notice that the mouse is captured and that you cannot exit the game