Video settings sliders invalid values

What I thought was going to happen

Clicking in the space between options on the "Mipmap Levels" sliders would automatically jump the slider head to the predetermined option (slider snapping).

What actually happened

Clicking on the slider caused the game to hang momentarily (normal behavior), but when the slider was clicked while the game was hanging, the slider head moved to an "invalid" location on the slider (i.e. not one of the options).

How to reproduce

1. Open the video settings screen
2. Click (don't drag) the Mipmap Level slider to cause the game to hang momentarily
3. While the game is hanging, click somewhere on the slider that doesn't correspond to a predefined level (e.g. between 0 and 1). This may not work on the first try, but should happen eventually.
4. Slider head is in the wrong position