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user requests automatic vertical align of lifelines on sequence diagram. user gborkowski has added in comments to issue 83110 (sequence diagram lifelines can not be aligned to top once syncrhonous message exist on them ) the following : It should be also possible to do it automatically, via some context action or auto-layout
see related issue 78195 - [55cat] Alignment and Distribution Tools/Options of objects This issue was filed separately because Sequence diagram has drawing engine and layout mechanism different from other diagrams.
message are aligned always now and can't be positioned freely, so may be the issue is resolved, will be in trunk in a week