Custom `word_separators` setting is not counted in moving inside a “word”

Right now you can change the `word_separators`, for example exclude the hyphen symbol (`-`) from it, and if you do this, moving inside a “words” while holding `ctrl` would skip the hyphen.

The expected behavior is to count it (like in TextMate), so in a word “someWord-with_something” the ctrl-stops would be “some|Word|-with|_something”, but right now it's “some|Word-with|_something”.