Wikimedia Bugzilla is closed!

Assume there's a page with wikitext:

"""
AAA

== BBB ==

CCC

DDD

== EEE ==

FFF
"""

When I mobile edit section 1 (BBB), the textarea contains:

"""
== BBB ==

CCC

DDD
"""

and in preview (if I save it with no change) would be:

"""
CCC

DDD
"""

If change wikitext in the textarea to:

"""
CCC

== BBB ==

DDD
"""

and try to save it, the preview is still:

"""
CCC

DDD
"""

Or if I use wikitext:

"""
== GGG ==

CCC

DDD
"""

There's still no difference in preview.

I know this is because MediaWiki's preview generates the heading in HTML, so we strip one heading in mobile preview for prettiness. Maybe we can only strip it when the new heading is identical (content and position ie. at the beginning) to the original, but this still makes removal of section heading invisible in preview...