Customizable minlines with g:markdown_minlines (#115)

README.markdown

@@ -20,6 +20,14 @@ To disable markdown syntax concealing add the following to your vimrc:
 
     let g:markdown_syntax_conceal = 0
 
+Syntax highlight is synchronized in 50 lines. It may cause collapsed
+highlighting at large fenced code block.
+In the case, please set larger value in your vimrc:
+
+    let g:markdown_minlines = 100
+
+Note that setting too large value may cause bad performance on highlighting.
+
 ## License
 
 Copyright © Tim Pope.  Distributed under the same terms as Vim itself.

syntax/markdown.vim

@@ -33,7 +33,10 @@ endfor
 unlet! s:type
 unlet! s:done_include
 
-syn sync minlines=10
+if !exists('g:markdown_minlines')
+  let g:markdown_minlines = 50
+endif
+execute 'syn sync minlines=' . g:markdown_minlines
 syn case ignore
 
 syn match markdownValid '[<>]\c[a-z/$!]\@!'