My guess is that X is sending button 1 press and release events, and
that GTK has internally remapped button 1 to secondary and button 2 to
primary for left-handed mousing. GTK needs to somehow determine if the
XInput slave device (i.e. the physical device) is a touchscreen or not.
Then it can interpret the button presses appropriately. Unfortunately, I
don't know if it can do this without some of the XInput multitouch
additions, which aren't upstream in X.org yet. There may be a way to do
it with XInput 1.x device types, but I'm not as familiar with it.

If my guess is correct, this has nothing to do with utouch or even
multitouch support. Any touchscreen in X would cause this behavior. If
my guess is incorrect, well then I have no clue what's going on :).

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https://bugs.launchpad.net/bugs/701086

Title:
  utouch does not recognize that I use a left-handed mouse

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