The touchpad is 104mmx75mm, but an AttrPalmSizeThreshold of 800 is too
aggressive, and even relatively-small fingers and thumbs register as
palms sporadically, stopping the mouse until you lift your hand and try again.
1600 was chosen because it's the point at which my fingers and thumbs,
held at a very low angle, stop registering as palms, so it should
acommodate bigger fingers.
I don't know if the [Apple Touchpads USB] default of 800 needs to be
updated too, or if it's a quirk of this particular touchpad.
(cherry picked from commit
ad50a9478976c5cbbb3a7acdef1290925a0c41da)
MatchVendor=0x05AC
MatchProduct=0x0237
AttrPalmSizeThreshold=1000
+
+[Apple Laptop Touchpad (MacBookPro11,2 among others)]
+MatchUdevType=touchpad
+MatchBus=usb
+MatchVendor=0x5AC
+MatchProduct=0x0262
+AttrPalmSizeThreshold=1600