The following text, posted in HTML mode as any sort of
comment, both explains and exploits the bug.
This paragraph not preceded by a marker...
<p>means that this one will have no whitespace above it
<p>even though this one does.
<p>Now let's get tricky. I'll
<blockquote><tt>quote something</tt></blockquote>
and try to continue
<p><p>but <i>this</i> paragraph needs <i>two</i>
markers before there's proper spacing.
I'll send the same as an attachment in case sourceforge
eats, parses, or corrupts the html tags.
Text which, posted in HTML mode, displays puzzling behavior of paragraph markers on Slashdot