class_docstr: ParameterItem displaying a clickable button.
code: def titleChanged(self):
      self.setSizeHint(0, self.button.sizeHint())
  
file_path: pyqtgraph/pyqtgraph/parametertree/parameterTypes/action.py
imports: from ...Qt import QtCore, QtWidgets, QtGui
  from ..Parameter import Parameter
  from ..ParameterItem import ParameterItem
label_desc: Use image node_id 3 for calling the ActionParameterItem obj's underlying member method code with example usage: obj.titleChanged() without return types