code: def mousePressEvent(self, event):
      super(UniqueLabelQListWidget, self).mousePressEvent(event)
      if not self.indexAt(event.pos()).isValid():
          self.clearSelection()
  
file_path: PaddleOCR/PPOCRLabel/libs/unique_label_qlist_widget.py
imports: from PyQt5.QtCore import Qt, QSize
  from PyQt5 import QtWidgets
label_desc: Use image node_id 1 for calling the UniqueLabelQListWidget obj's underlying member method code with example usage: obj.mousePressEvent(event) without return types