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513534c
demo site
(Get the code!)
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.