Use a timeout of 5s for searchpairpos

The timeout is supported with Vim 7.3.429 at least.

In case of issues (breaking older Vims), this could be wrapped to
fallback to some (higher) max offset.

Fixes #64.

Author: blueyed

indent/python.vim

@@ -34,7 +34,7 @@ if !exists('g:python_pep8_indent_multiline_string')
     let g:python_pep8_indent_multiline_string = 0
 endif
 
-let s:maxoff = 50
+let s:search_timeout = 5000
 let s:block_rules = {
             \ '^\s*elif\>': ['if', 'elif'],
             \ '^\s*except\>': ['try', 'except'],
@@ -105,15 +105,13 @@ function! s:find_opening_paren(...)
         return ret
     endif
 
-    let stopline = max([0, line('.') - s:maxoff])
-
     " Return if cursor is in a comment.
     exe 'if' s:skip_search '| return [0, 0] | endif'
 
     let positions = []
     for p in s:paren_pairs
         call add(positions, searchpairpos(
-           \ '\V'.p[0], '', '\V'.p[1], 'bnW', s:skip_special_chars, stopline))
+           \ '\V'.p[0], '', '\V'.p[1], 'bnW', s:skip_special_chars, 1, s:search_timeout))
     endfor
 
     " Remove empty matches and return the type with the closest match