fix #291

src/types/YText.js

@@ -815,6 +815,7 @@ export class YText extends AbstractType {
     super._callObserver(transaction, parentSubs)
     const event = new YTextEvent(this, transaction, parentSubs)
     const doc = transaction.doc
+    callTypeObservers(this, transaction, event)
     // If a remote change happened, we try to cleanup potential formatting duplicates.
     if (!transaction.local) {
       // check if another formatting item was inserted
@@ -863,7 +864,6 @@ export class YText extends AbstractType {
         }
       })
     }
-    callTypeObservers(this, transaction, event)
   }
 
   /**

tests/y-text.tests.js

@@ -5,6 +5,23 @@ import * as math from 'lib0/math.js'
 
 const { init, compare } = Y
 
+/**
+ * @param {t.TestCase} tc
+ */
+export const testDeltaAfterConcurrentFormatting = tc => {
+  const { text0, text1, testConnector } = init(tc, { users: 2 })
+  text0.insert(0, 'abcde')
+  testConnector.flushAllMessages()
+  text0.format(0, 3, { bold: true })
+  text1.format(2, 2, { bold: true })
+  let delta = null
+  text1.observe(event => {
+    delta = event.delta
+  })
+  testConnector.flushAllMessages()
+  t.compare(delta, [])
+}
+
 /**
  * @param {t.TestCase} tc
  */