title: How to save all buffers in vim (even if they haven't changed)?
body: <p>I have this particular problem as i use the vim-latex-live-preview-plugin which recompiles my .tex document everytime it is written to disk. So my workflow is the following:</p>
  
  <ul>
  <li>make some changes</li>
  <li>hit <code>:w</code></li>
  <li>see changes in pdf.</li>
  </ul>
  
  <p>However, now I'm working on a larger document where I make use of the <code>\input{example_input}</code> command. My current workflow is</p>
  
  <ul>
  <li>work in example_input.tex</li>
  <li>save example_input.tex with <code>:w</code></li>
  <li>switch buffer to "root" tex file</li>
  <li>save "root" text file
  *) entire document is recompiled
  *) switch back to buffer I'm actually working in (example_input.tex).</li>
  </ul>
  
  <p>This is clearly undesirable. 
  First, I thought <code>:wa</code> does what I want, but unfortunately <code>:wa</code> only writes to disk if the buffer has actually changed (unlike <code>:w</code>).
  Is there something like <code>:wa</code> (save all buffers) with the behavior of <code>:w</code> (write to disk even if buffer didn't change)?</p>