Bug report

Bug summary

Pressing a key in a MPL plot causes a beep. This is not a serious problem, but is annoying.

Code for reproduction

use the code here https://matplotlib.org/stable/gallery/event_handling/keypress_demo.html, but add

import matplotlib
matplotlib.use('wxAgg')

Actual outcome

Every time a key is pressed, I hear a bell sound (a beep).

Expected outcome

I should be able to eliminate this using this in the callback:

def on_press(event):
    event.guiEvent.Skip(False)
    ...

The reason for this is in this callback handler in backend_wx.py

    def _onKeyDown(self, event):
        """Capture key press."""
        key = self._get_key(event)
        FigureCanvasBase.key_press_event(self, key, guiEvent=event)
        if self:
            event.Skip()

Since the method ends with event.Skip() (same as event.Skip(True)) the call to event.guiEvent.Skip(False) is ignored.
If this is rewritten as:

    def _onKeyDown(self, event):
        """Capture key press."""
        if self:
            event.Skip()
        key = self._get_key(event)
        FigureCanvasBase.key_press_event(self, key, guiEvent=event)

Then existing code will function as before, but there is the option to suppress the beep. One could argue that .Skip(False) should be the default, but that would be a change in how MPL functions.

Matplotlib version

• Operating system: MacOS 10.15.7
• Matplotlib version: 3.3.2
• Matplotlib backend: MacOSX
• Python version: 3.9.1
• Jupyter version: N/A
• Other libraries: wxpython 4.1.1

default conda channels except wxpython from pypi.