Short description

In 0.13.3 I was able to add additional items to the menu of the histogram gradient. The changes in 0.13.4 mean that this now gives a TypeError

  File ".../pyqtgraph/graphicsItems/GradientEditorItem.py", line 499, in contextMenuClicked
    name, source = action.data()
TypeError: cannot unpack non-iterable NoneType objec

Code to reproduce

import pyqtgraph as pg
import numpy as np
from pyqtgraph.Qt import QtWidgets

app = pg.mkQApp("ImageView Example")
win = QtWidgets.QMainWindow()
img = pg.ImageView()
img.setImage(np.zeros((100,100)))
win.setCentralWidget(img)

action = QtWidgets.QAction("Test")
action.triggered.connect(lambda :print("Action triggered"))
menu = img.getHistogramWidget().gradient.menu
menu.addAction(action)

win.show()
if __name__ == '__main__':
    pg.exec()

Expected behavior

Add a new menu entry that can be used. (works in 0.13..3)

Real behavior

Menu item works, but gives the above error message

Tested environment(s)

• PyQtGraph version: 0.13.4
• Qt Python binding: PyQt5 5.15.9 Qt 5.15.8'
• Python version: 3.10.13
• NumPy version: 1.21.6
• Operating system: Linux
• Installation method: conda

Additional context

I think this was introduced by
#2779
c2372a2

The menu items in the GradientEditorItem are now expected to have data, that is used to change the gradient:

name, source = action.data()

I can provide a patch