[delta] useAttributes doesn't clean up empty objects

src/types/YText.js

@@ -1081,6 +1081,7 @@ export class YText extends AbstractType {
                */
               const formattingAttribution = object.assign({}, d.usedAttribution)
               const attributesChanged = /** @type {{ [key: string]: Array<any> }} */ (formattingAttribution.attributes = object.assign({}, formattingAttribution.attributes ?? {}))
+              debugger
               if (value === null) {
                 delete attributesChanged[key]
               } else {

src/utils/AttributionManager.js

@@ -56,7 +56,9 @@ import * as encoding from 'lib0/encoding'
  * @return {Attribution?}
  */
 export const createAttributionFromAttributionItems = (attrs, deleted) => {
-  if (attrs == null) return null
+  if (attrs == null) {
+    return null
+  }
   /**
    * @type {Attribution}
    */

src/utils/Delta.js

@@ -300,7 +300,7 @@ export class DeltaBuilder extends AbstractDelta {
    * @return {this}
    */
   useAttributes (attributes) {
-    this.usedAttributes = object.isEmpty(attributes) ? null : object.assign({}, attributes)
+    this.usedAttributes = attributes
     return this
   }
 
@@ -345,7 +345,7 @@ export class DeltaBuilder extends AbstractDelta {
    * @param {Attribution?} attribution
    */
   useAttribution (attribution) {
-    this.usedAttribution = object.isEmpty(attribution) ? null : object.assign({}, attribution)
+    this.usedAttribution = attribution
     return this
   }
 

src/utils/RelativePosition.js

@@ -72,7 +72,6 @@ export class RelativePosition {
      * @type {number}
      */
     this.assoc = assoc
-    this.item && console.log('created relpos', this.item) // @todo remove
   }
 }