[PATCH] shell: Enhance the basic random positioning algorithm

[Bill Spitzak]

Kristian Høgsberg wrote:

> The compositor is not going to discard part of the buffer like that.
> If the window is fullscreen or maximized or maximized
> vertically/horizontally, the client has to know that and render a
> buffer that works for that window state.

If I drag a window so that a portion of the shadow is off-screen, the 
compositor is discarding part of the buffer.