Insert space when text contains line break

[seezee]

I use markdown to create

elements like so:

Foo
  : Bar

Which outputs:

<dl>
  <dt>Foo</dt>
  <dd>Bar</dd>
</dl>

In the search result excerpt, this shows up as "FooBar".

It looks like this also occurs between text nodes in any block level element. For instance, if a paragraph ends with "Foo" and the next one starts with "Bar", the excerpt is "FooBar".

Excerpts should respect line breaks/carriage returns and insert a space between elements.