[Minor] Lua_mime: One more offset fix

diff --git a/lualib/lua_mime.lua b/lualib/lua_mime.lua
index aab61cb77551075e4bd8fbfb8f90292337bba4d4..76e3c6195880dde7da1c117a2aad7af615a96a1a 100644 (file)
--- a/lualib/lua_mime.lua
+++ b/lualib/lua_mime.lua
@@ -354,7 +354,7 @@ local function do_replacement (task, part, mp, replacements,
     local fragments = {}
     for _,m in ipairs(matches_flattened) do
       if m[1][1] > cur_start then
-        fragments[#fragments + 1] = content:span(cur_start, m[1][1] - cur_start)
+        fragments[#fragments + 1] = content:sub(cur_start, m[1][1])
         fragments[#fragments + 1] = replacements[m[2]]
         cur_start = m[1][2] + 1 -- end of match
       end