'Copy code block' feature doesn't work with highlighted syntax

[Antreesy]

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Regresion from nextcloud/vue 8.21.0

• highlight triggers content re-rendering, and MessageBody loses a reference to DOM nodes
  

  spreed/src/components/MessagesList/MessagesGroup/Message/MessagePart/MessageBody.vue

  Lines 333 to 343 in 0406abc

  	mounted() {
  	if (this.isEditable) {
  	EventBus.on('editing-message-processing', this.setIsEditing)
  	}
  	if (!this.containsCodeBlocks) {
  	return
  	}
  	this.codeBlocks = Array.from(this.$refs.messageMain?.querySelectorAll('pre'))
  	},