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Reproduced on Mac OS X (any java version). Reproducibility on other platforms is under question. When I use the Hide Partner Links editor toolbar icon, the "swim-lanes" are hidden, but their "scrollbars" (round icons, which allow to scroll the partner links lists) remain. Also the diagram does not receive mouse events when I click on areas that would otherwise be occupied by the "swim-lanes". The latter is obviously more serious, as it essentially blocks me from selecting/ using toolbars of activities which are close enough to the left side of the diagram.
Issue is reproducible for all operation systems. Fixed in gfesbv23, changeset 71fd21f5b2ba.
*** Bug 184076 has been marked as a duplicate of this bug. ***
This is verified to work correctly in CAPS 63 M5 build (20101103-1248). This issue can be closed.