title: EditText with inputType numberDecimal has underlines
body: <p>I'm seeing what I think is strange behavior using an EditText with inputType=numberDecimal.</p>
  
  <p>On my Galaxy Nexus (using Google Keyboard), when I tap into the editText field, often times there's an underline present:</p>
  
  <p><img src="https://i.stack.imgur.com/7mY89.png" alt="enter image description here"></p>
  
  <p>It almost looks like it could be auto correct, auto complete, or text suggest but that wouldn't make sense for a numberDecimal input type.  I've tried textNoSuggestions and as expected this did not remove the underlines.</p>
  
  <p>When present, these underlines are currently causing me an issue.  I have a textwatcher attached as a listener on the editText.  After tapping into the field, whenever this underline is present and the cursor is positioned as in the screenshot:</p>
  
  <ol>
  <li><p>When a user enters a 2, onTextChanged receives: 0.002.  This is correct.  I then format this number to be 0.02 in afterTextChanged.</p></li>
  <li><p>At this point if a user enters a 3, onTextChanged receives: 0.020023.  This is not correct.  For some reason the "002" is being appended into the editText value before the 3.  This obviously throws off my formatting logic in afterTextChanged.</p></li>
  </ol>
  
  <p>My textwatcher logic has been working for a long time and only recently starting having this issue.  Anytime I move the cursor around, making the underline go away then I see no issues with onTextChanged receiving the "incorrect" value.</p>
  
  <p>As far as what's changed to make this underline start happening, I believe I've narrowed it down to the Google Keyboard app.  I see this issue when I use Google Keyboard version 1.1.1881.801980.  I uninstalled updates and rolled back to version 4.2.2-573038, and with that version there are never any underlines and therefore no issues with my textwatcher.</p>
  
  <p>So, my questions:</p>
  
  <p>Does anyone know what this underline is supposed to be in a numberDecimal field?  Is it legit or is this a bug?  </p>
  
  <p>Bug or not, does anyone know how to prevent this underline from ever appearing when a user taps into the field?</p>