After some more thought, I think this is more complex. We can determine
if a trackpad is a button pad, but we need more information to determine
how much bottom area should be masked. I think we should do the
following:

1. Export the input device properties through udev (I'm assuming it doesn't do 
this yet)
2. Create a new xorg.conf.d entry in 51-synaptics-quirks.conf for trackpads 
that match a buttonpad rule and match the Synaptics vendor. This entry would 
specify a reasonable bottom area to mask for these devices.
3. Maybe create a new entry in 51-synaptics-quirks.conf for the magic trackpad 
to mask out a smaller area since it's so large.

My guess is that all Synaptics trackpads have the same percentage of
bottom area that should be disabled. By creating separate entries for
different device vendors and/or individual devices we can provide the
right defaults.

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https://bugs.launchpad.net/bugs/762768

Title:
  cannot select text with left click with touchpad

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