Headings' "id" attribute is incorrectly URL encoded

When a page contains headings with international characters, the fragment identifier (the "id" attribute of the corresponding heading) should not be URL encoded.

Confluence is incorrectly encoding this "id" attribute, which breaks the inter-page links created by the TOC macro in Firefox.

Steps to reproduce:

1. create a page containing lots of blank lines, followed by the heading Á
2. in the beginning of the page, include the TOC macro, which will create a link to the A section
3. save the page
4. using Firefox, click on the link in the TOC

Expected results: The browser should scroll to the A section

Actual results: nothing happens

At first I thought this was a Firefox bug, but it turns out it's a Confluence bug. Additional details:

• https://bugzilla.mozilla.org/show_bug.cgi?id=643275
• https://bugs.webkit.org/show_bug.cgi?id=56733