title: Insert line widget at the end of line
body: <p>I am writing a tool which validates predicate logic proofs that were entered into a CodeMirror editor instance in realtime.
  For that purpose, I want to display dynamically generated information right next to the line the information is associated to. Additionally, these hints should be aligned within a block but should not cover any code.
  Sadly, I have no clue how to hack codemirror so that this will work.</p>
  
  <p>My current approach is to display the hint below the line using "LineWidgets":
  <img src="https://i.stack.imgur.com/nk2F4.png" alt="Current approach"></p>
  
  <p>But this looks quite confusing.
  My aim is to achive something like this (of course without the blank lines):
  <img src="https://i.stack.imgur.com/lcvwS.png" alt="Goal"></p>
  
  <p>Both LineWidgets and Widgets does not come into question, because LineWidgets always take a whole line and Widgets act like a character which can be removed by the user. 
  Also, widgets cannot be aligned vertically.</p>
  
  <p>Does someone have an idea or suggestions how these hints could be displayed?</p>