title: Syntax highlighting randomly disappears during file saving
body: <p>I'm using vim to edit some python files and recently it occurs sporadically that the syntax highlighting disappears after I save the buffer inside vim. I tried to reset <code>syntax on</code> and <code>set filetype=python</code> but to no avail. I have no clue of what causes this problem at all, so right now I have minimal diagnostic info. But has anyone encountered this before, or where could things break down?</p>