fix(drag-handle-vue-2): fix vue2 warnign about objects as default (#6857)

* fix(drag-handle-vue-2): use factory function for default

Vue2 requires factory functions for defaults for objects and arrays.

Prevent the warning
> Invalid default value for prop "PluginKey": Props with type Object/Array must use a factory function to return the default value.

Signed-off-by: Max <max@nextcloud.com>

* Fix prop default handling for Vue 2

---------

Signed-off-by: Max <max@nextcloud.com>
Co-authored-by: bdbch <6538827+bdbch@users.noreply.github.com>

Author: max-nextcloud

.changeset/moody-trees-rescue.md

@@ -0,0 +1,5 @@
+---
+'@tiptap/extension-drag-handle-vue-2': patch
+---
+
+Use factory function for object default value as required by vue 2.

.changeset/serious-tools-hear.md

@@ -0,0 +1,5 @@
+---
+"@tiptap/extension-drag-handle-vue-2": patch
+---
+
+Fixed a bug that would cause Vue 2 to throw errors in console because Vue 2 expects factory functions for prop defaults

packages/extension-drag-handle-vue-2/src/DragHandle.ts

@@ -20,7 +20,7 @@ export const DragHandle = Vue.extend({
   props: {
     pluginKey: {
       type: [String, Object] as PropType<DragHandleProps['pluginKey']>,
-      default: dragHandlePluginDefaultKey,
+      default: () => dragHandlePluginDefaultKey,
     },
 
     editor: {