Issue Summary

This is reproducible on Data Center: no

Steps to Reproduce

1. Install a 3rd-party app such as Gliffy Diagrams for Confluence or Handy Macros
2. Create a page with the Table of Contents macro and a Gliffy diagram
3. Format the Gliffy diagram as a Heading (H2)

Expected Results

We expect the diagram to be skipped from the table of contents or to appear in the TOC.

Actual Results

The TOC breaks showing Javascript code.

Workaround

Manually edit the affected pages and format the 3rd-party macro as a Paragraph.