Sequence: Alt/Else Long Label With Uninvolved Participant

A long alt/else condition label next to a participant with no messages inside that block — the block widens to fit the label without cutting off that participant's own lifeline, which matters once a real condition description runs longer than a word or two.

Conditional Block

sequence-alt-else-long-label-with-uninvolved-participant.mmd

sequenceDiagram
  participant A
  participant B
  participant C
  alt credentials valid
    A->>B: x
  else credentials rejected
    A->>B: y
  end

Output

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Sequence: Basic Messages

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Sequence: Self-Messages