I have the opposite problem:
how to get rid of spacing between paragraphs.
I even tried to re-convert with the Calibre converter with --remove-paragraph-spacing
Zero effect. The Calibre viewer still shows gaps between paragraphs.
FBReader shows correctly, though. No gaps between paragraphs.
Oh, it seems that the Calibre stand-alone converter simply added br twice(!) instead of creating p, when converting docx to epub:
<br class="calibre9"/><br class="calibre9"/>
So the problem was caused not by the Calibre viewer but by the Calibre converter.
A replace all is needed. One br is quite enough.
Well, I am not sure if I can really blame the Calibre converter either.
It finds that double br in the docx xml:
</w:t><w:br/><w:br/><w:t>
and it is dumb (or smart?) enough to repeat it. No, nothing smart about it
