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synclient AreaLeftEdge=-1000 doesn't work

I'm using this driver with Debian GNU/Linux on an Apple M1-based machine, which has a huge touchpad which I find impossible to work with unless I set both AreaRightEdge (to around 4000) and AreaLeftEdge; however, the default synclient.c source caps the AreaLeftEdge minimum at 0, so 1 is the lowest usable value, and that disables the entire half of that touchpad.

Will attach the obvious patch once I figure out how to do that in this GitLab.

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