xfrun buglet...

[Jasper Huijsmans]

Ok, it is a known problem and it's not easy to fix. Let me try to
explain.

The window margins only work for windows that are placed automatically.
If a window specifically asks for a position, e.g. the run dialog, it
will be put there.

It is also hard to avoid other windows, because you'd have to check all
running windows. There is no way for xfrun to know where the panel is.
The only alternative is to have it popup in the center of the screen. 

The taskbar is different, because it sets a special window manager hint
that in fact reduces the workarea; so, because the window manager keeps
all windows inside the screen, no windows will ever cover the taskbar.
Obviously, floating windows like gkrellm or the panel, that can be moved
anywhere on the screen cannot use this hint.

	Jasper