Add text objects for list items

I put the function in lst.vim, not base.vim because it uses some
functions from lst.vim and because it's list stuff.

autoload/vimwiki/lst.vim

@@ -1410,6 +1410,24 @@ function! vimwiki#lst#setup_marker_infos() "{{{
   else
     "regex that matches nothing
     let g:vimwiki_rxListNumber = '$^'
+  endif
+
+endfunction "}}}
+
+function! vimwiki#lst#TO_list_item(inner, visual) "{{{
+  let lnum = prevnonblank('.')
+  let item = s:get_corresponding_item(lnum)
+  if item.type == 0
+    return
+  endif
+  let from_line = item.lnum
+  if a:inner
+    let to_line = s:get_last_line_of_item(item)
+  else
+    let to_line = s:get_last_line_of_item_incl_children(item)
+  endif
+  normal! V
+  call cursor(to_line, 0)
   normal! o
   call cursor(from_line, 0)
 endfunction "}}}