fix(task-item): prevent onBlur being trigged when toggled (#5520)

.changeset/slow-lies-promise.md

@@ -0,0 +1,5 @@
+---
+"@tiptap/extension-task-item": patch
+---
+
+Prevent `onBlur` from being trigged when a task item is toggled

packages/extension-task-item/src/task-item.ts

@@ -137,6 +137,7 @@ export const TaskItem = Node.create<TaskItemOptions>({
 
       checkboxWrapper.contentEditable = 'false'
       checkbox.type = 'checkbox'
+      checkbox.addEventListener('mousedown', event => event.preventDefault())
       checkbox.addEventListener('change', event => {
         // if the editor isn’t editable and we don't have a handler for
         // readonly checks we have to undo the latest change