Visual glitch on border's bottom left corner, with a scaling factor of 1.75

[dnkl]

I was testing how foot behaved under various scaling factors, and noticed what looks like a mistake in river's rendering of the SSD's bottom left corner.

Note how the left border continues down below the bottom border:

I didn't notice any issues with 1.5 or 2x scaling, only at 1.75x.

Version: 0.2.0-dev-d93ee2c - built december 11:th (yup, getting a bit outdated...)