use printf instead of '.' (#1106)

Author: bounceme

indent/javascript.vim

@@ -311,8 +311,8 @@ function s:IsContOne(cont)
 endfunction
 
 function s:IsSwitch()
-  return search('\m\C\%'.join(b:js_cache[1:],'l\%').
-        \ 'c{\_s*\%(\%(\/\/.*\_$\|\/\*\_.\{-}\*\/\)\@>\_s*\)*\%(case\|default\)\>','nW'.s:z)
+  return search(printf('\m\C\%%%dl\%%%dc%s',b:js_cache[1],b:js_cache[2],
+        \ '{\_s*\%(\%(\/\/.*\_$\|\/\*\_.\{-}\*\/\)\@>\_s*\)*\%(case\|default\)\>'),'nW'.s:z)
 endfunction
 
 " https://github.com/sweet-js/sweet.js/wiki/design#give-lookbehind-to-the-reader