Better Palm Rejection

[voodoosmbus]

Better Palm Rejection

[1Revenger1]

#80

With the above pull request, I added zones, and keyboard/trackpoint timeouts to the zones. With these, plus some reworked shape analysis, this seems to work quite well actually. This has the added benefit of allowing gestures while typing or directly after, while having very long (2 seconds) rejection periods for palms (this helps a lot actually in my testing). I also now track what fingers get invalidated and mak them stay invalidated until lifted.

One additional feature to add may be is a "cooldown" or timer which activates when an invalidated finger gets lifted. This would help with the palm momentarily lifting or with fingers at the top of the trackpad for using the trackpoint buttons while resting the thumb on the trackpad. Whether or not I want to put in the time to actually implement this or not depends a lot on how much I run into this to be honest - though good shape analysis seems to do decently well already for this task.

The zones logic with keyboard timeout I will likely upstream - though some feedback on this will be appreciated.