--- Comment #4 from Matthias Reischenbacher <matthias8...@gmx.at> 2010-12-10
07:20:46 EST ---
(In reply to comment #3)
> (In reply to comment #0)
> > Apparently the KnuthElement's position is null (oldElement.getPosition()). I
> > attached a patch which adds an additional check in order to avoid the
> > exception. This might not be a real solution, because I'm not sure if it's
> > valid that the position is null.
> I spent some more time on the validity of a null position. Auxiliary positions
> have null subposition, see InlineLayoutManager.getAuxiliaryPosition(), line:
> If a position is unwrapped often enough, this null position is reached. The
> chosen solution, i.e. not unwrapping if the null position is reached, adds a
> layer of wrapping around the null position, because later in the method all
> positions are wrapped again. Apparently that is not a problem.
thanks for looking into this. I also had a further look at the code and I think
there is still a problem when unwrapping and wrapping positions which is
causing Bug 49870 . When the InlineLayoutManager adds NonLeafPositions for
border-left and border-right it sets the sub positions to null. Unwrapping the
position causes the NonLeafPosition to get lost:
I'm unsure if the problem should be fixed when adding the border
NonLeafPositions in the first place or we add an additional check in the
applyChanges() method. What do you think?
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