With that patch by Chase, I also wonder what would happen if two touch
devices were used simultaneously.

When I both touch my screen and click my conventional mouse button, I
get two button events, but the state is the bitwise or of both, so the
second click will be "pressed button 1 while button 1 was pressed".
Makes sense, in a certain way, although it might well confuse some
applications.

But what if I had two touch devices controlling the core pointer? I
believe it is likely with the current setup that in this case, the
second device would generate a ButtonPress with state 0x000. Or is it
impossible for more than one touch device to control the core pointer at
a given time? I don't have more than one device, so I can't test this.

I'll agree that given current technology, this seems a rather rare
corner case, and probably not worth the effort to deal with properly.
But any shortcomings in that respect should perhaps at least be
documented somewhere.

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https://bugs.launchpad.net/bugs/1015183

Title:
  Inconsistent mouse events for Acer T231H multitouch monitor

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