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Lifelines should always be visually identifiable even when scrolling down a large diagram. For instance, the sequence diagram could integrate a pinned banner at the top of the diagram displaying the position and labels of the lifelines below. Thus, when scrolling down, even though the head of the lifelines would be hidden, the various lifelines could still be identified easily.
Implementing this seems not trivial. Tooltips already display the name of lielines and what they represent, as a workaround.
(In reply to Mathilde Arnaud from comment #1) > Implementing this seems not trivial. > Tooltips already display the name of lielines and what they represent, as a > workaround. Could you give some more information regarding why this seem not trivial? I assume that you have seen how this is handled in the legacy tooling, i.e. with a header above/outside the scrollable diagram area showing the names of what the lifeline represents, and that you have concluded that this is not trivial. Or have you considered some other solution (not sure how to interpret "pinned banner" in the description)?
The idea would be to have a header outside of the editable diagram area, yes. Providing such a header is possible in theory, but the diagram has not been thought that way from the beginning, so it would be easier to implement a new version. This feature would be useful but there are more pressing concerns.
*** Bug 446430 has been marked as a duplicate of this bug. ***
