In Sigil, if text is broken up over multiple lines in the html file but isn't actually a separate tag, the editor will condense it for you, so that
Code:
<p>I wrote
my text
like this</p>
becomes
Code:
<p>I wrote my text like this</p>.
It would be nice if Calibre's beautify feature could do this as well, so that I'd have one less thing I need to open Sigil to do.