Question about fullscreen across all monitors in xfwm4

[Stephan Haller]

Am Donnerstag, den 19.12.2013, 12:46 +0200 schrieb Jari Rahkonen:
> 18.12.2013 22:31, Stephan Haller wrote:
> > Hi,
> >
> > I'm too stupid to get it from source code and I think the authors of
> > xfwm4 can answer my silly question ;)
> 
> I'm just a user, not an Xfwm developer, but that shouldn't really 
> matter, right?
Of course, of course ;)

> > Does xfwm4 support a fullscreen window across all connected monitors?
> 
> Yes, it does. However, you cannot set up relative monitor positions with 
> Xfce's monitor configuration panel (yet). Use xrandr on the command line 
> or a graphical frontend like arandr to do this. Xfwm4 does it's part 
> just fine.
I think my question was too short to explain what I want to do ;) My
question is not the matter of configuring the placement of each monitor.

I want to ask if xfwm4 supports to span a fullscreen window across all
connected monitors so it is just one mega-great(tm) window. I think I
can create a window and move it to upper-left position of desktop and
resize it to cover the whole desktop over all monitors. But I need the
"fullscreen" flag of the window to get it always above all other windows
like panel etc.

As far as I discovered xfwm4 will place a fullscreen only to one monitor
and resizes it to the size of this monitor.

Is there a way to override this behaviour? Would it be possible and make
sense to set a window fullscreen and to move and resize it to get it
spanned across all windows?

Regards,
Stephan