Fix: Setext Style headings must contain a line with only equal signs or dashes, ref #11

Author: mzlogin

ftplugin/markdown.vim

@@ -14,7 +14,7 @@ endif
 let g:GFMHeadingIds = {}
 
 function! s:HeadingLineRegex()
-    return '\v(^.+$\n\=+|^.+$\n\-+|^#{1,6})'
+    return '\v(^.+$\n^\=+$|^.+$\n^\-+$|^#{1,6})'
 endfunction
 
 function! s:GetSections(beginRegex, endRegex)

test/GFM.md

@@ -15,9 +15,15 @@
 heading1
 ===
 
+not heading1
+===ha
+
 heading2
 --
 
+not heading2
+---ha
+
 ===
 
 ---