Draft logic for non-breaking spaces.

[tmpfs]

Ok, here is a quite crude attempt to fix the problem, let me know what you think.

Really we should know that the previous tag element is an inline element. Otherwise things like <div><div></div> </div> will be converted to something like:

<div>
  <div></div>&nbsp;
</div>

[coveralls]

Coverage remained the same at 100.0% when pulling b893c95 on makestatic:nbsp into e08ace7 on reshape:master.

[jescalan]

This is good, great start and thanks for catching this issue and diving right in! Perhaps we should put this specific transform behind an option or something?

I guess there's no real way we can know if the previous element is an inline element, since any element can get display: inline, so this might be the best we can do!

I think the next steps are perhaps adding a config option to control this setting and adding this to the test, then adding a comment above the code block to indicate what it's actually doing.