fixed ignored comment width with sync

gallery/example2.typ

@@ -61,8 +61,8 @@
   _gap()
   
   _sync({
-    _seq("bob", "alice")
-    _seq("bob", "craig")
+    _seq("bob", "alice", comment: "Synched", comment-align: "start")
+    _seq("bob", "craig", comment: "Synched", comment-align: "start")
   })
   _gap()
   

src/renderer.typ

@@ -20,6 +20,16 @@
   let pars-i = get-participants-i(participants)
   let cells = ()
 
+  // Unwrap syncs
+  let i = 0
+  while i < elements.len() {
+    let elmt = elements.at(i)
+    if elmt.type == "sync" {
+      elements = elements.slice(0, i + 1) + elmt.elmts + elements.slice(i + 1)
+    }
+    i += 1
+  }
+
   // Compute max lifeline levels
   for elmt in elements {
     if elmt.type == "seq" {