Auto breaking comments split only on whitespace

Fixes #1002115
Auto breaking comments add asterisk on break in first line

Fixes #1002120
Auto breaking comments don't move cursor to wrong position anymore

Fixes #1002119
Auto breaking comments don't consider backspaces anymore

Fixes #1002116
Merge pull request #709 from sschaef/t-auto-breaking-comments-fixes

auto breaking comments fixes