The conversation moved on to a different but related issue, multiple
screen scenarios, and I thought it worth recording here for future
reference:

<smspillaz> IntuitiveNipple: out of curiousity, is there any reason to use 
multi-screen instead of multi-output?
<IntuitiveNipple> smspillaz: I'm not sure... what's the difference!? My aim is 
to have two independent views. This is the way the setup-tools have always done 
it.
<IntuitiveNipple> On this system, it's nvidia. I've done the same on a Matrox 
G450 too.
<smspillaz> IntuitiveNipple: with multi-output it is easier to have different 
output sizes, compiz handles it better and you can move windows between outputs
<IntuitiveNipple> Okay. The idea is *not* to be able to move windows between 
displays. 
<IntuitiveNipple> I don't want xinerama/twinview 
<crdlb> then I guess you're set :)
<smspillaz> why would you want that?
<IntuitiveNipple> Why do you prefer chocolate to bananas? :)
* smspillaz tried multi-screen once, it had more bugs than a fluro lantern
<smspillaz> IntuitiveNipple: I guess we could *emulate* that functionality by 
writing a plugin that doesn't allow you to move windows between outputs ;-)
<IntuitiveNipple> I use xdmx to run 4 screens (the other two on a 2nd PC) from 
the one PC
<smspillaz> ah interesting
<IntuitiveNipple> smspillaz: I think that might confuse some apps though since 
the screen size would be a larger 'virtual' and so windows placed beyond the 
right side of the primary screen would, if the other displays weren't in use, 
disappear.
<smspillaz> that is probably the reason you have multi-screen then ;-)
<IntuitiveNipple> In my scenario, I use a laptop. When I'm at home-base I want 
as many screens as possible but when travelling I only have the one. 
<IntuitiveNipple> When I used twinview/xinerama the problem was that windows 
I'd had previously on the extra displays would remember their coordinates and 
when loaded, would be unreachable :)
<smspillaz> that is a bug worth filing
<IntuitiveNipple> You mean... it now has a 'use case' ?
<smspillaz> no, the fact that when you disconnect outputs windows become 
unreachable
<smspillaz> that shouldn't happen
<smspillaz> I don't know if there is an output disconnected event though that 
we can hook
IntuitiveNipple> That is a more general problem with metacity too, so I assumed 
it was an application-specific thing going on.
<IntuitiveNipple> There is a nuance to that though - very often the laptop will 
be running dual screens when the session starts. At some point it'll get 
suspended or hibernated and I'll go mobile. When it resumes it's still in the 
same user session with my work as it was, and unless I log-out/log-in it won't 
figure out the external display is no longer attached.

-- 
Out-of-bounds areas for multiple X screens with different dimensions
https://bugs.launchpad.net/bugs/331918
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