koreader/koreader-base — pull request #292 by hwhw (2014-12-05 21:26:48+00:00)
Title: avoid doing zero-size refreshes

Those refresh requests will crash (at least) Kobos' framebuffer
driver and create the image of a locked-up device.
Beware: device is not actually locked up and does in fact react
to touch screen events!