Code completion makes illegal suggestions

[DartBot]

This issue was originally filed by [email protected]

---

With the following code:
class Editor
{
  HtmlElement _inputDiv;
  HtmlElement _input;
  HtmlElement _inputscroller;
  HtmlElement _code;
  HtmlElement _mover;
  HtmlElement _gutter;
  HtmlElement _gutterText;
  HtmlElement _lineSpace;
  HtmlElement _measure;
  HtmlElement _cursor;
  HtmlElement _selectionDiv;
  HtmlElement _lineDiv;
  HtmlElement _wrapper;

  
  void init()
  {
    _wrapper =
    document.query('#wrapper').

    
    
  }
  

}

After the ('#wrapper'), press '.' to bring up completion, then backspace. The code completion now suggests with red circle the fields, e.g. _inputDiv as completions. Using identifiers in this context isn't legal.

[pq]

Set owner to @stevemessick.
Added Area-Editor, Triaged labels.

[stevemessick]

Added Fixed label.