Comment 65 for bug 742544

> I'm pretty sure I can make the Unity code clever enough to just always do the right thing --
> If a primary monitor has been defined then use that,
> else use the left-most monitor as the current Unity 4.x code does.

That makes sense.

> The only hard part about this solution is that gdk_screen_get_primary_monitor does not always give a certain answer as to whether a primary monitor has been set at all. That's where some more work is required.

Yeah...

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What about showing the display settings panel when a new monitor is plugged in?