[pmwiki-users] >>pre<< adds extra lines???

[Petko Yotov]

On Saturday 23 January 2010 21:40:13, dan mcmullen wrote :
> on further examination, the behavior seems to be that any number of
> blank lines in >>pre<< markup appear as two lines in the output.  and an
> extra blank line appears at the beginning of the >>pre<< output.

The >>pre<< thing is just applying a CSS class on a div block, and the block 
it is what the markup engine produced.

Notably, the markup engine considers 1 or more empty lines as one (1) 
paragraph break, and usually there is an invisible <div class='vspace'></div> 
between the 2 paragraphs.

To preserve all whitespaces and all empty lines, you should use the [@...@] 
markup:

[@
abc   def


   ghi       jkl
@]


If >>pre<< is required, instead of [@...@], you can still use it. To prevent 
the paragraph break, you can have on the empty line the non-breakable space 
&nbsp;, or even the "empty space" [==], like this:

>>pre<<
abc
[==]
[==]
def
>><<

Thanks,
Petko