Fix off-by-one error in get_next_line and get_prev_line

The functions stopped at the end/start block marker (respectively)
instead of returning the following line. This caused issues when the
function was subsequently called in markdown mode since the start and
end block markers are the same.

This fixes #407

autoload/vimwiki/lst.vim

@@ -419,11 +419,13 @@ function! s:get_next_line(lnum, ...)
     while cur_ln <= line('$') && getline(cur_ln) !~# vimwiki#vars#get_syntaxlocal('rxPreEnd')
       let cur_ln += 1
     endwhile
-    let next_line = cur_ln
+    let next_line = cur_ln + 1
   else
-    let next_line = nextnonblank(a:lnum+1)
+    let next_line = a:lnum + 1
   endif
 
+  let next_line = nextnonblank(next_line)
+
   if a:0 > 0 && getline(next_line) =~# vimwiki#vars#get_syntaxlocal('rxHeader')
     let next_line = s:get_next_line(next_line, 1)
   endif
@@ -440,19 +442,19 @@ endfunction
 "Returns: lnum-1 in most cases, but skips blank lines and preformatted text
 "0 in case of nonvalid line and a header, because a header ends every list
 function! s:get_prev_line(lnum)
-  let prev_line = prevnonblank(a:lnum-1)
+  let cur_ln = a:lnum - 1
 
-  if getline(prev_line) =~# vimwiki#vars#get_syntaxlocal('rxPreEnd')
-    let cur_ln = a:lnum - 1
+  if getline(cur_ln) =~# vimwiki#vars#get_syntaxlocal('rxPreEnd')
     while 1
       if cur_ln == 0 || getline(cur_ln) =~# vimwiki#vars#get_syntaxlocal('rxPreStart')
         break
       endif
       let cur_ln -= 1
     endwhile
-    let prev_line = cur_ln
   endif
 
+  let prev_line = prevnonblank(cur_ln)
+
   if prev_line < 0 || prev_line > line('$') ||
         \ getline(prev_line) =~# vimwiki#vars#get_syntaxlocal('rxHeader')
     return 0

doc/vimwiki.txt

@@ -3471,6 +3471,8 @@ https://github.com/vimwiki-backup/vimwiki/issues.
 2.5 (in progress)~
 
 New:~
+    * PR #735: Make list-toggling work properly even when code blocks are
+      embedded within the list in Markdown mode.
     * PR #711: Allow forcing VimwikiAll2HTML with !
     * PR #702: Make remapping documentation more accessible to newer vim users
     * PR #673: Add :VimwikiGoto key mapping.

test/list_update.vader

@@ -0,0 +1,191 @@
+Include: vader_includes/vader_setup.vader
+
+Given vimwiki (Sample nested list, vimwiki syntax):
+  * [ ] Top Level
+    * [ ] Child 1
+    * [ ] Child 2
+
+    * [ ] Post space
+
+    {{{code
+    * [ ] print "hello, world"
+    }}}
+
+    {{{morecode
+    print "hello again"
+    }}}
+
+    * [ ] Post code
+      * [ ] Sub-child
+
+      * [ ] Sub-sub-child
+
+Execute (Set syntax to default):
+  call SetSyntax('default')
+
+Do (Toggle top-level):
+  \<C-Space>
+
+Expect (All tree toggled):
+  * [X] Top Level
+    * [X] Child 1
+    * [X] Child 2
+
+    * [X] Post space
+
+    {{{code
+    * [ ] print "hello, world"
+    }}}
+
+    {{{morecode
+    print "hello again"
+    }}}
+
+    * [X] Post code
+      * [X] Sub-child
+
+      * [X] Sub-sub-child
+
+Do (Toggle child):
+  j
+  \<C-Space>
+
+Expect (Child toggled, top updated):
+  * [.] Top Level
+    * [X] Child 1
+    * [ ] Child 2
+
+    * [ ] Post space
+
+    {{{code
+    * [ ] print "hello, world"
+    }}}
+
+    {{{morecode
+    print "hello again"
+    }}}
+
+    * [ ] Post code
+      * [ ] Sub-child
+
+      * [ ] Sub-sub-child
+
+Do (Toggle sub-child):
+  G
+  \<C-Space>
+
+Expect (Sub-child toggled, parents updated):
+  * [.] Top Level
+    * [ ] Child 1
+    * [ ] Child 2
+
+    * [ ] Post space
+
+    {{{code
+    * [ ] print "hello, world"
+    }}}
+
+    {{{morecode
+    print "hello again"
+    }}}
+
+    * [o] Post code
+      * [ ] Sub-child
+
+      * [X] Sub-sub-child
+
+Given markdown (Sample nested list, markdown syntax):
+  * [ ] Top Level
+    * [ ] Child 1
+    * [ ] Child 2
+
+    * [ ] Post space
+
+    ```code
+    * [ ] print "hello, world"
+    ```
+
+    ```morecode
+    print "hello again"
+    ```
+
+    * [ ] Post code
+      * [ ] Sub-child
+
+      * [ ] Sub-sub-child
+
+Execute (Set syntax to markdown):
+  call SetSyntax('markdown')
+
+Do (Toggle top-level):
+  \<C-Space>
+
+Expect (All tree toggled):
+  * [X] Top Level
+    * [X] Child 1
+    * [X] Child 2
+
+    * [X] Post space
+
+    ```code
+    * [ ] print "hello, world"
+    ```
+
+    ```morecode
+    print "hello again"
+    ```
+
+    * [X] Post code
+      * [X] Sub-child
+
+      * [X] Sub-sub-child
+
+Do (Toggle child):
+  j
+  \<C-Space>
+
+Expect (Child toggled, top updated):
+  * [.] Top Level
+    * [X] Child 1
+    * [ ] Child 2
+
+    * [ ] Post space
+
+    ```code
+    * [ ] print "hello, world"
+    ```
+
+    ```morecode
+    print "hello again"
+    ```
+
+    * [ ] Post code
+      * [ ] Sub-child
+
+      * [ ] Sub-sub-child
+
+Do (Toggle sub-child):
+  G
+  \<C-Space>
+
+Expect (Sub-child toggled, parents updated):
+  * [.] Top Level
+    * [ ] Child 1
+    * [ ] Child 2
+
+    * [ ] Post space
+
+    ```code
+    * [ ] print "hello, world"
+    ```
+
+    ```morecode
+    print "hello again"
+    ```
+
+    * [o] Post code
+      * [ ] Sub-child
+
+      * [X] Sub-sub-child
+
+Include: vader_includes/vader_teardown.vader