section ids disappear with lua filter

[<denis.maier-NSENcxR/0n0@public.gmane.org>]

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Hi,

I use this lua filter to move references after a special heading to the document metadata :

```lua
-- local pprint = require('pprint')

references = {}

function getRefsFromDiv (div)
    if div.identifier == 'literatur' then
        pandoc.walk_block(div, {
            Para = function(el)
                table.insert(references, el.content)
            end})
        return {} -- remove from main body
    end
end

function addRefsToMeta (meta)
                if not next(references) then
                   return meta
                else
                               meta.biblio = references
                               if not meta.bibliotitle then
                                               if pandoc.utils.stringify(meta['lang']) == 'en'  then
                                                               meta.bibliotitle = "References"
                                               else
                                                               meta.bibliotitle = "Literatur"
                                               end
                               end
                               -- pprint(references)
                               return meta
                end
end

function put_in_divs(doc)
    local blocks = {}
    for i,el in pairs(doc.blocks) do
        table.insert(blocks, el)
    end
    local newblocks = pandoc.utils.make_sections(nil, 1, blocks)
    return pandoc.Pandoc(newblocks, doc.meta)
end

function flatten_divs(div)
    if div.classes[1] == 'section' then
        return div.content
    end
end

return {
    { Pandoc = put_in_divs },
    { Div = getRefsFromDiv },
    { Meta = addRefsToMeta },
    { Div = flatten_divs},
  }
```

The filter works, but it has the side effect that it also removes all section ids.

Input:

```md
---
lang: en
---

# Introduction

Bla Bla

Bla Bla


# Bibliography {#literatur}

Test Test

Test Test
```

pandoc input.md

```
<h1 id="introduction">Introduction</h1>
<p>Bla Bla</p>
<p>Bla Bla</p>
<h1 id="literatur">Bibliography</h1>
<p>Test Test</p>
<p>Test Test</p>```

pandoc input.md -L heading-refs-to-meta.lua

```
<h1>Introduction</h1>
<p>Bla Bla</p>
<p>Bla Bla</p>
```

Any ideas how I can preserve the ids?

Best,
Denis

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