title: Updating font-lock keywords in emacs without major mode reload
body: <p>I am doing small modification to SLIME, so that I can get all currently loaded symbols from Lisp, analyze them and make font-lock fontify them.</p>
  
  <p>I managed to do all these steps, but I have a small problem - when keyword list changes in font-lock the buffer is not updated unless you restart the major lisp-mode. I don't want to restart lisp-mode every time I update keywords, because I have several hooks on lisp-mode that I want to run only when I load the file for the first time. </p>
  
  <p>Is there an other way to update font-lock so it reads all then new keywords and fontifies the buffer accordingly? Switching off font-lock and using <code>font-lock-fontify-buffer</code> does not do the trick.</p>
  
  <p>UPD: Added bounty - the question is still up. I need a way to reload font-lock keyword without reloading major mode.</p>