Fix performance of pen tool

FLUTTER_VERSION

@@ -1 +1 @@
-3.16.0-7.0.pre
+3.16.0-0.1.pre

app/lib/bloc/document_bloc.dart

@@ -134,7 +134,7 @@ class DocumentBloc extends ReplayBloc<DocumentEvent, DocumentState> {
       );
     });
     on<ElementsCreated>((event, emit) async {
-      final current = state;
+      var current = state;
       if (current is! DocumentLoadSuccess) return;
       if (!(current.embedding?.editable ?? true)) return;
       var data = current.data;
@@ -168,6 +168,12 @@ class DocumentBloc extends ReplayBloc<DocumentEvent, DocumentState> {
           .onRenderersCreated(current.page, renderers)) {
         refresh();
       }
+      if (current != state) {
+        final next = state;
+        if (next is! DocumentLoadSuccess) return;
+        data = next.data;
+        current = next;
+      }
       return _saveState(
           emit,
           current.copyWith(
@@ -176,7 +182,7 @@ class DocumentBloc extends ReplayBloc<DocumentEvent, DocumentState> {
                   content: (List.from(current.page.content)
                     ..addAll(elements)))),
           renderers);
-    }, transformer: sequential());
+    });
     on<ElementsChanged>((event, emit) async {
       final current = state;
       if (current is! DocumentLoadSuccess) return;

app/lib/handlers/pen.dart

@@ -33,15 +33,20 @@ class PenHandler extends Handler<PenTool> {
     submitElement(context.viewportSize, context.buildContext, event.pointer);
   }
 
+  bool _currentlyBaking = false;
+
   Future<void> submitElement(
       Size viewportSize, BuildContext context, int index) async {
     final bloc = context.read<DocumentBloc>();
-    var element = elements.remove(index);
+    final element = elements.remove(index);
     if (element == null) return;
     lastPosition.remove(index);
     bloc.add(ElementsCreated([element]));
-    bloc.refresh();
+    if (_currentlyBaking) return;
+    _currentlyBaking = true;
     await bloc.bake();
+    _currentlyBaking = false;
+    bloc.refresh();
   }
 
   void addPoint(BuildContext context, int pointer, Offset localPosition,