Behavior of some word movements

[tardypad]

Using the latest version from the repo with default config

Here are some movements which should be fixed to make them consistent with vim behavior.

• dw wrong cursor position
  setup: buffer correct horse battery staple with cursor on r of horse.
  press: dw
  result: buffer correct hobattery staple with cursor on e of battery
  expected: same buffer but cursor on b of battery
  (similar problem appears if the cursor is initially at the beginning of the word)

• cw wrong buffer and cursor position
  setup: buffer correct horse battery staple with cursor on r of horse.
  press: cw
  result: buffer correct hobattery staple with cursor on b
  expected: buffer correct ho battery staple with cursor on space between ho and battery
  (similar problem appears if the cursor is initially at the beginning of the word)