Internal links (TOC, sections and figures) have been broken since reportlab updated to 3.5.19

[shamil-ru]

When updating reportlab from 3.5.18 to 3.5.19, internal links become unusable.

Description of problem

Check whether reportlab installed has the version 3.5.19.

RST file: toc.rst

===============================
Document with Table of Contents
===============================

-------
Example
-------

.. contents:: Table of Contents
   :depth: 2

Heading 1
=========

Normal, **Bold**, *Italic*.

Heading 2
---------

``Mono``.

Heading 3
~~~~~~~~~

.. code:: python

  #!/usr/bin/env python

  print("Hello, world!")

Run: rst2pdf toc.rst

Open toc.pdf and try to click to table of contents items.

What is the expected output? What do you see instead?
When downgrading reportlab to 3.5.18, links in table of contents work well, but after upgrading they become like heading-1-... etc and don't work.

🖥 Versions

python -V
Python 2.7.16

pip freeze | grep rst2pdf
rst2pdf==0.94

pip freeze | grep reportlab
reportlab==3.5.19

pip freeze | grep Sphinx

(Optional) wordaxe version :

Which operating system are you using?

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=19.04
DISTRIB_CODENAME=disco
DISTRIB_DESCRIPTION="Ubuntu 19.04"
Linux 5.0.0-13-generic #14-Ubuntu SMP Mon Apr 15 14:59:14 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Additional information

I guess this commit breaks the compatibility:
https://bitbucket.org/rptlab/reportlab/commits/c46115a85b61f4822026e72f5949a4fb1b63ba73

[akrabat]

PDFs that don't work:

toc.pdf is the generated PDF from the above rest:
toc.pdf

Test issue 110: click the links in the footer to go back:
test_issue_110.pdf