Merge pull request #929 from chrisbra/preview-window

Also draw a nice statusline in the preview window

plugin/airline.vim

@@ -27,7 +27,8 @@ function! s:init()
 endfunction
 
 function! s:on_window_changed()
-  if pumvisible()
+  if pumvisible() && (!&previewwindow ||
+        \ (g:airline_exclude_preview && &previewwindow))
     return
   endif
   call s:init()