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From "Georg Datterl" <georg.datt...@geneon.de>
Subject AW: spanning block in second column ignores orphans and margin-bottom
Date Tue, 02 Dec 2008 14:44:33 GMT
Hi Vincent,

>>> And, speaking about that, the 'orphans' property on the 'U' paragraph 
>>> is at its default value of 2, so there shouldn't be just one line of 
>>> that paragraph at the bottom of page 3.
>> AbstractBreaker.doLayout() creates a blockList for the fo:block. This list
>> contains (I guess) a KnuthBlockBox for each line and a KnuthPenalty for 
>> each possible break. This list is correct, there are two boxes before the
>> first break and two boxes after the last break, as required by orphan and
>> widow parameter. Obviously the break after the first line is introduced later,
>> I guess somewhere down doPhase3(). 

> I had a short debugging session and the problem has to do with the fact that a
> forced breaking point has to be chosen because there is not enough space on the
> page to make the first two lines of the spanning block fit. Normally this 
> mechanism should defer the content to the next page but for some reason this 
> doesn't happen. Apparently the bug doesn't appear when column balancing operates
> and the same conditions are re-created (space available for only one line at the
> bottom of the page). 

I filed a bug report using the default column balancing. It's not related to my changes 
and not only ignores orphans but margin-bottom as well. Maybe Jeremias could help us here,
if it is related to the balancing method? I think I recall he was involved there.

Georg Datterl
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