fix: correctly hide lifelines with _hide

src/core/draw/hide.typ

@@ -3,6 +3,9 @@
 #let render(sync) = get-ctx(ctx => {
   set-ctx(c => {
     c.hidden = true
+    for i in range(c.lifelines.len()) {
+      c.lifelines.at(i).lines.push(("hide",))
+    }
     return c
   })
 })
@@ -10,6 +13,9 @@
 #let render-end(sync) = get-ctx(ctx => {
   set-ctx(c => {
     c.hidden = false
+    for i in range(c.lifelines.len()) {
+      c.lifelines.at(i).lines.push(("unhide",))
+    }
     return c
   })
 })

src/core/draw/participant.typ

@@ -320,9 +320,20 @@
     let destructions = ()
     let lines = ()
 
+    let hidden = false
+
     // Compute lifeline rectangles + destruction positions
     for line in ctx.lifelines.at(p.i).lines {
       let event = line.first()
+      if event == "hide" {
+        hidden = true
+      } else if event == "unhide" {
+        hidden = false
+      }
+      if hidden and event in ("create", "enable") {
+        continue
+      }
+
       if event == "create" {
         last-y = line.at(1)