Bug#846382: display artifacts in Blender

[ian_bruce at mail.ru]

I confirm this bug. It's extremely easy to reproduce; simply moving the
mouse pointer across any of the controls is sufficient to trigger
flickering and display corruption. This program is currently unusable.

I, too, have Mesa v13 installed. Whatever the cause of the problem is,
it's of very recent origin. However, it has been the case for a long
time that using the "Toggle Window Fullscreen" option from the "Window"
menu (as opposed to the window manager "maximize" button) causes similar
problems.