title: Xcode: code loses syntax coloring
body: <p>I find that in various situations Objective-C code in Xcode 3.1 (Leopard) can fail to get appropriate syntax coloring after typing or lose coloring that it had.</p>
  
  <p>This isn't just a "refresh" issue with new custom symbols -- but affects Cocoa framework symbols as well.</p>
  
  <p>Sometimes CMD-a to select all text on the code page will make the coloring (re)appear, sometimes double-clicking on a line to select it will work, sometimes I have to add/delete a space in a symbol to get that symbol to (re)color. Rebuilding, or closing/reopening the project may or may not work.</p>
  
  <p>Is this a known issue with Xcode? For something so annoying to me, I'm not finding the plentiful discussions of it on SO and elsewhere I'd expect.</p>
  
  <p>And is there any command to force global syntax recoloring?</p>