Handle edge case when swiping over excluded region

- When x == edgeWidth, then we consider the touch within
  the edge region, but not actually in the exclusion
  region provided by the IME whose bounds are
  [0, gesture inset left)
- Add a bit more logging to track some more back
  issues

Bug: 178561216
Test: Swipe on edge near edge of IME
Change-Id: I9c09079e620814bd83413edcbe571dbd67aec4a9