Disable syntax for indented code blocks.

The behavior within lists is not correct.

doc/vimwiki.txt

@@ -3489,7 +3489,6 @@ https://github.com/vimwiki-backup/vimwiki/issues.
 New:~
     * PR #787: |:VimwikiRenameLink| works for all directories: even
       wiki_root/diary/2019-12-11.md if current file is wiki_root/dir1/file.md.
-    * Add support for markdown indented code blocks.
     * Issue #764: fenced code blocks are properly supported for markdown
       syntax i.e. more than 3 backticks, adds tilde support.
     * Set default |vimwiki-option-list_margin| = 0 for markdown syntax.

syntax/vimwiki_markdown.vim

@@ -82,7 +82,8 @@ let s:markdown_syntax.rxListDefine = '::\%(\s\|$\)'
 " Preformatted text (code blocks)
 let s:markdown_syntax.rxPreStart = '\%(`\{3,}\|\~\{3,}\)'
 let s:markdown_syntax.rxPreEnd = '\%(`\{3,}\|\~\{3,}\)'
-let s:markdown_syntax.rxIndentedCodeBlock = '^\s*\n\(\(\s\{4,}[^ ]\|\t\+[^\t]\).*\n\)\+\(^\s*\n\)'
+" TODO see syntax/vimwiki_markdown_custom.vim for more info
+" let s:markdown_syntax.rxIndentedCodeBlock = '\%(^\n\)\@1<=\%(\%(\s\{4,}\|\t\+\).*\n\)\+'
 
 " Math block
 let s:markdown_syntax.rxMathStart = '\$\$'

syntax/vimwiki_markdown_custom.vim

@@ -190,9 +190,10 @@ syntax match VimwikiTableRow /^\s*|.\+|\s*$/
                            \ VimwikiEqInT,
                            \ @Spell
 
+" TODO fix behavior within lists https://github.github.com/gfm/#list-items
 " indented code blocks https://github.github.com/gfm/#indented-code-blocks
-execute 'syntax match VimwikiIndentedCodeBlock /' . vimwiki#vars#get_syntaxlocal('rxIndentedCodeBlock') . '/'
+" execute 'syntax match VimwikiIndentedCodeBlock /' . vimwiki#vars#get_syntaxlocal('rxIndentedCodeBlock') . '/'
-hi def link VimwikiIndentedCodeBlock VimwikiPre
+" hi def link VimwikiIndentedCodeBlock VimwikiPre
 
 " syntax group highlighting
 hi def link VimwikiImage VimwikiLink

test/syntax.vader

@@ -226,23 +226,6 @@ Given vimwiki (Markdown, Text and Vim):
   set hlsearch
   ~~~~~~~~~~~
 
-  Here is an indented code block:
-
-      int main()
-
-  Must be surrounded by blank lines.
-
-  This isn't a code block:
-      int main()
-  - But this is one in a list
-  - Item
-    - subitem
-
-        int main()
-
-    - list item
-  - done
-
 Execute (Set syntax markdown):
   let g:vimwiki_global_vars['vimwiki_automatic_nested_syntaxes'] = 1
   call SetSyntax('markdown')
@@ -269,9 +252,6 @@ Execute (Assert Code syntax):
   AssertEqual SyntaxAt(24, 1), 'vimLineComment'
   AssertEqual SyntaxAt(25, 1), 'vimCommand'
   AssertEqual SyntaxAt(26, 1), 'VimwikiPre'
-  AssertEqual SyntaxAt(30, 1), 'VimwikiIndentedCodeBlock'
-  AssertEqual SyntaxAt(35, 1), ''
-  AssertEqual SyntaxAt(40, 1), 'VimwikiIndentedCodeBlock'
 
 
 # 11 Math {{{1