<p dir="auto">I don't think that the spell-check package is doing anything wrong here, so I assume that this visual bug is due to decorations stretching across soft-wrap boundaries when maybe they shouldn't:</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/1038121/5606912/de32d7fc-93fa-11e4-985e-02304d21b02b.png"><img src="https://cloud.githubusercontent.com/assets/1038121/5606912/de32d7fc-93fa-11e4-985e-02304d21b02b.png" alt="screen shot 2015-01-04 at 10 17 03 am" style="max-width: 100%;"></a></p>
<p dir="auto"><em>(As a side note, I'm impressed that supercalifragilisticexpialidocious is in the OS X dictionary. I had to come up with another long nonsense word <g-emoji class="g-emoji" alias="laughing" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f606.png">😆</g-emoji>)</em></p>
<p dir="auto">I would expect that "absafragginglutely" would be decorated, but <em>not</em> the space between "absafragginglutely" and the previous instance of the word "testing".</p>
<p dir="auto">Atom v0.166.0-25b44ce on Mac OS X 10.10.1</p>
<p dir="auto">/cc <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/benogle/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/benogle">@benogle</a></p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://camo.githubusercontent.com/88668fb5aae5a7b8893e2647ab95ebd67143c2b32bc566bbea9ff05c9ba54e83/687474703a2f2f692e696d6775722e636f6d2f3377476e7032302e706e67"><img src="https://camo.githubusercontent.com/88668fb5aae5a7b8893e2647ab95ebd67143c2b32bc566bbea9ff05c9ba54e83/687474703a2f2f692e696d6775722e636f6d2f3377476e7032302e706e67" alt="1" data-canonical-src="http://i.imgur.com/3wGnp20.png" style="max-width: 100%;"></a></p>
<p dir="auto">And when I make the window wider again:</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://camo.githubusercontent.com/26e0a7181e712c4ada50dde9ab811bea2d7e7c806f47cfa74b35b932e8d48480/687474703a2f2f692e696d6775722e636f6d2f4e71686765676c2e706e67"><img src="https://camo.githubusercontent.com/26e0a7181e712c4ada50dde9ab811bea2d7e7c806f47cfa74b35b932e8d48480/687474703a2f2f692e696d6775722e636f6d2f4e71686765676c2e706e67" alt="2" data-canonical-src="http://i.imgur.com/Nqhgegl.png" style="max-width: 100%;"></a></p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="'global':
  'exception-reporting':
    'userId': '84c65616-dd5b-347b-3d53-50153c0eb9a2'
  'welcome':
    'showOnStartup': false
  'core': {}
  'editor':
    'invisibles': {}
  'spell-check': {}

spell-check 0.45.0
atom 0.165.0"><pre class="notranslate"><code class="notranslate">'global':
  'exception-reporting':
    'userId': '84c65616-dd5b-347b-3d53-50153c0eb9a2'
  'welcome':
    'showOnStartup': false
  'core': {}
  'editor':
    'invisibles': {}
  'spell-check': {}

spell-check 0.45.0
atom 0.165.0
</code></pre></div>