24,8 overlay bug in 4.2.0-*

[Vadim Gutnik <gutnik@MIT.EDU>]

I think there's a bug in the 24 bit overlay that both the "glint" and
"mga" drivers support. On both machines where I have 4.2.0-0pre1v4
installed, one with a matrox millenium II and the mga driver, and the
other with a "3Dlabs GLINT Permedia 4" card and the glint driver, 

xsetroot -solid "black" 

overwrites the _entire_ screen, with only the prompt and the X-cursor
remaining. xrefresh corrects the display. In both cases, I see this
behavior even with Option "NoAccel" set. 

        Vadim