Bug report

Bug summary

Non alphanumeric key events are reported incorrectly on webagg.

Code for reproduction

MPLBACKEND=webagg python -c 'from pylab import *; plot(); gcf().canvas.mpl_connect("key_press_event", lambda e: print(e.key)); show()'

then press some keys while using e.g. an https://en.wikipedia.org/wiki/AZERTY keyboard layout.

Actual outcome

& is reported as 1, etc.

Expected outcome

Correct keys.

Matplotlib version

• Operating system: linux
• Matplotlib version: head
• Matplotlib backend (print(matplotlib.get_backend())): webagg
• Python version: 39

From a quick look mpl.js is using https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/which + a hard-coded table; MDN says that which is deprecated and suggests using https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key instead.