Fix namespace error message

[izak]

The problem snuck in after I fixed the double-body problem some time ago. By using the innerHTML of the body instead of serializing the body, I ended up with a xmlns on every top level element inside the body.

When you hit enter in Aloha, it makes a copy of whatever element it's in. It also copies all the attributes. It didn't like copying xmlns, hence the error message.

This fixes the problem using somewhat of a sledgehammer approach. It parses the body/head out using regex. Normally that's a bad idea for html, but here we use fresh html from XMLSerializer, so it should be safe.

[philschatz]

🍰

[kathi-fletcher]

Not really working for me.

I branched from master and merged in this branch. Then I opened the test book and entered a new line beneath the first paragraph in the first module that opens: http://33.33.33.10/#repo/oerpub/test-book/edit/content/02-Momentum-and-impulse.section-01.html|content/siyavula-physics-12.opf

This produced the namespace error.

I tried it in the second module titled "Momentum" and did not get the error.

When back to "Introduction to Momentum" and still got the error.

Tried "Add a module" to see if it happens in a new module and everything went dark. Not sure if that is relevant or not.

[kathi-fletcher]

I bet the problem is with content that already has the bad namespaces. That causes more to get generated.

[izak]

I bet Phil is right!

Should be as simple as killing them all parse time.

[kathi-fletcher]

I think we should merge this to avoid getting more of these in the content. But I would still like to clean up the old ones.