When I try this in Kubuntu 9.10 (Karmic), I see a scrollbar also in the resulting merge pane, however it is still hard to handle, because the two diff views above stay word wrapped, whereas the merge-view is not word wrapped, but when you scroll to the right, also the diff-views move and thus you cannot look at view A and B any more if you need to scroll a lot to the right in the merge-view.
Probably either the merge-view should also use word-wrap, or the view A/B should not move along in this case.
When I try this in Kubuntu 9.10 (Karmic), I see a scrollbar also in the resulting merge pane, however it is still hard to handle, because the two diff views above stay word wrapped, whereas the merge-view is not word wrapped, but when you scroll to the right, also the diff-views move and thus you cannot look at view A and B any more if you need to scroll a lot to the right in the merge-view.
Probably either the merge-view should also use word-wrap, or the view A/B should not move along in this case.