title: Vim: automatically highlight all occurences of selected word
body: <p>Notepad++ has this really neat feature that if you select one word, every other occurence of the word is automatically highlighted, like this (only the first <em>autocmd</em> is highlighted by me):</p>
  
  <p><img src="https://i.stack.imgur.com/PIlVF.png" alt="N++ highlighting screenshot"></p>
  
  <p>I am aware that a similar thing has already been <a href="https://stackoverflow.com/questions/3431184/vim-highlight-all-occurrence-of-a-selected-word">asked</a>, but I am hoping that there is a  solution which does not require manual interaction.</p>