[R] grid and gtkDevice package clipping bug.

[M.Kondrin]

Hello!
When I draw points on grid's viewport with clip set to TRUE clipping 
does not have effect on some symbols. It happens only when drawing over 
gtkDevice (GTK ver. 1.2) (with postscript device clipping works OK - 
take a look at this screenshot 
http://www.hppi.troitsk.ru/Kondrin/clipbug.png) and only with symbols 
that are drawn with commands other than gdk_draw_polygon() (i.e. circles 
- gdk_draw_arc() - and squares - gdk_draw_rect()).