Consider the following example code:

import matplotlib.pyplot as plt
fig = plt.figure()

def on_key(event):
    print('you pressed', event.key, event.xdata, event.ydata)

fig.canvas.mpl_connect('key_press_event', on_key)

Now when I run this code and press Shift+Left Arrow, the qt5 backend correctly detects this event as shift+left. However, the osx backend (which AFAIK is the default backend on macOS) doesn't register the shift key at all, I only get left. Is it possible to fix this somehow?