Fix folding broken by other syntax highlighting.

When syntax highlighting is enabled for fenced code blocks, the syntax
highlighting of the language in the code block can overwrite folding
configuration, breaking Markdown folding.  Reinitialise Markdown folding
configuration every time syntax highlighting is refreshed to ensure that
Markdown folding works.

diff --git a/after/ftplugin/markdown.vim b/after/ftplugin/markdown.vim
index 9ee01006960b118c1a82ddec0958b047496e54db..41dfd944e971a2c20ee44eea1e467b689df35457 100644 (file)
--- a/after/ftplugin/markdown.vim
+++ b/after/ftplugin/markdown.vim
@@ -151,10 +151,20 @@ let b:fenced_block = 0
 let b:front_matter = 0
 let s:vim_markdown_folding_level = get(g:, "vim_markdown_folding_level", 1)
 
-if !get(g:, "vim_markdown_folding_disabled", 0)
-    setlocal foldexpr=Foldexpr_markdown(v:lnum)
-    setlocal foldmethod=expr
-    if get(g:, "vim_markdown_folding_style_pythonic", 0) && get(g:, "vim_markdown_override_foldtext", 1)
-        setlocal foldtext=Foldtext_markdown()
-    endif
-endif
+function! s:MarkdownSetupFolding()
+  if !get(g:, "vim_markdown_folding_disabled", 0)
+      setlocal foldexpr=Foldexpr_markdown(v:lnum)
+      setlocal foldmethod=expr
+      if get(g:, "vim_markdown_folding_style_pythonic", 0) && get(g:, "vim_markdown_override_foldtext", 1)
+          setlocal foldtext=Foldtext_markdown()
+      endif
+  endif
+endfunction
+call s:MarkdownSetupFolding()
+augroup Mkd
+    " These autocmds need to be kept in sync with the autocmds calling
+    " s:MarkdownRefreshSyntax in ftplugin/markdown.vim.
+    autocmd BufWinEnter,BufWritePost <buffer> call s:MarkdownSetupFolding()
+    autocmd InsertEnter,InsertLeave <buffer> call s:MarkdownSetupFolding()
+    autocmd CursorHold,CursorHoldI <buffer> call s:MarkdownSetupFolding()
+augroup END

diff --git a/ftplugin/markdown.vim b/ftplugin/markdown.vim
index 989aef83bd356bd2129c6297d7be44744cd104a5..200293e840bbc2bb1181900e727cd0270fe00407 100644 (file)
--- a/ftplugin/markdown.vim
+++ b/ftplugin/markdown.vim
@@ -780,6 +780,8 @@ function! s:MarkdownClearSyntaxVariables()
 endfunction
 
 augroup Mkd
+    " These autocmd calling s:MarkdownRefreshSyntax need to be kept in sync with
+    " the autocmds calling s:MarkdownSetupFolding in after/ftplugin/markdown.vim.
     autocmd! * <buffer>
     autocmd BufWinEnter <buffer> call s:MarkdownRefreshSyntax(1)
     autocmd BufUnload <buffer> call s:MarkdownClearSyntaxVariables()