https://bugs.kde.org/show_bug.cgi?id=346795

--- Comment #9 from Martin Gräßlin <mgraess...@kde.org> ---
> Once the relative position of the multiple monitors is set, it seems to me 
> all the offsets are also fully known.

It's not that simple obviously. I spent quite some thinking about the issue
since March when I was first made aware of it as KWin needs to handle this
situation correctly on Wayland.

We have two not connected pieces of information: there is a touch input device,
and an output. We don't know that they belong together (neither the touch
screen yells "I belong to HDMI1", nor the xrandr output yells
"/dev/input/event7 is my touch screen"). We just don't have that information.
If the system starts up with two displays one of them being a touch screen, we
simply don't know to which one the touch screen belongs. So yes it needs to be
translated, just we don't know how. We can try all kind of heuristics, but at
some point (two identical displays) our heuristics are going to fail, because
we don't have sufficient knowledge.

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