Fix AutoExitBlockRule

lib/models/rules/insert.dart

@@ -155,11 +155,8 @@ class AutoExitBlockRule extends InsertRule {
       return null;
     }
 
-    Map<String, dynamic> attributes = cur.attributes ?? <String, dynamic>{};
-    BlockQuoteAttribute blockQuoteAttribute = BlockQuoteAttribute();
-    blockQuoteAttribute.value = null;
-    attributes.addAll(blockQuoteAttribute.toJson()); // TODO
-    return Delta()..retain(index)..retain(1, attributes);
+    // retain(1) should be '\n', set it with no attribute
+    return Delta()..retain(index)..retain(1, null);
   }
 }
 

lib/models/rules/rule.dart

@@ -56,6 +56,9 @@ class Rules {
       {int len, Object data, Attribute attribute}) {
     Delta delta = document.toDelta();
     for (var rule in _rules) {
+      if (rule.type != ruleType) {
+        continue;
+      }
       delta =
           rule.apply(delta, index, len: len, data: data, attribute: attribute);
       if (delta != null) {

lib/widgets/proxy.dart

@@ -69,7 +69,7 @@ class RenderBaselineProxy extends RenderProxyBox {
       0.0;
 
   @override
-  void performLayout() {
+  performLayout() {
     super.performLayout();
     _prototypePainter.layout();
   }