Lifeline should inherit the stroke style from the actor

Fixes #1137

d2layouts/d2sequence/sequence_diagram.go

@@ -386,15 +386,24 @@ func (sd *sequenceDiagram) addLifelineEdges() {
 		}
 		actorLifelineEnd := actor.Center()
 		actorLifelineEnd.Y = endY
+		style := d2graph.Style{
+			StrokeDash:  &d2graph.Scalar{Value: fmt.Sprintf("%d", LIFELINE_STROKE_DASH)},
+			StrokeWidth: &d2graph.Scalar{Value: fmt.Sprintf("%d", LIFELINE_STROKE_WIDTH)},
+		}
+		if actor.Attributes.Style.StrokeDash != nil {
+			style.StrokeDash = actor.Attributes.Style.StrokeDash
+		}
+		if actor.Attributes.Style.StrokeWidth != nil {
+			style.StrokeWidth = actor.Attributes.Style.StrokeWidth
+		}
+		if actor.Attributes.Style.Stroke != nil {
+			style.Stroke = actor.Attributes.Style.Stroke
+		}
+
 		sd.lifelines = append(sd.lifelines, &d2graph.Edge{
-			Attributes: &d2graph.Attributes{
-				Style: d2graph.Style{
-					StrokeDash:  &d2graph.Scalar{Value: fmt.Sprintf("%d", LIFELINE_STROKE_DASH)},
-					StrokeWidth: &d2graph.Scalar{Value: fmt.Sprintf("%d", LIFELINE_STROKE_WIDTH)},
-				},
-			},
-			Src:      actor,
-			SrcArrow: false,
+			Attributes: &d2graph.Attributes{Style: style},
+			Src:        actor,
+			SrcArrow:   false,
 			Dst: &d2graph.Object{
 				ID: actor.ID + fmt.Sprintf("-lifeline-end-%d", go2.StringToIntHash(actor.ID+"-lifeline-end")),
 			},

e2etests/stable_test.go

@@ -1487,8 +1487,13 @@ finally: {
     sequence: {
         shape: sequence_diagram
 		# items appear in this order
-        scorer
-        concept
+        scorer {
+					style.stroke: red
+					style.stroke-dash: 2
+				}
+        concept {
+					style.stroke-width: 6
+				}
         essayRubric
         item
         itemOutcome