Reset to initial empty state

Author: sergeief

src/model/immutable/CharacterMetadata.js

@@ -104,7 +104,9 @@ class CharacterMetadata extends CharacterMetadataRecord {
   }
 
   static clear(): void {
-    pool = pool.clear();
+    pool = Map([
+      [Map(defaultRecord), EMPTY],
+    ]);
   }
 }
 

src/model/immutable/__tests__/CharacterMetadata-test.js

@@ -106,3 +106,10 @@ test('must reuse objects by defaulting config properties', () => {
     CharacterMetadata.create({style: UNDERLINE}) === underlined,
   ).toMatchSnapshot();
 });
+
+test('clear pool', () => {
+  CharacterMetadata.clear();
+  expect(
+    CharacterMetadata.create({style: NONE, entity: 'a'}) !== withEntity,
+  ).toBe(true);
+});