Bug summary

The GTK4 backend does not set the guiEvent attribute on GUI events.

Code for reproduction

from pylab import *; mpl.use("gtk4agg")
gcf().canvas.mpl_connect("button_press_event", lambda e: print(e.guiEvent))
show()

# and click anywhere

Actual outcome

None

Expected outcome

<GdkButtonEvent at 0x...>

Additional information

Probably the fix is simply to pass guiEvent=controller.get_current_event() to each of the event callbacks in backend_gtk4.py

Operating system

macOS, but should be irrelevant

Matplotlib Version

3.10.0.dev786+g60458da93e

Matplotlib Backend

gtk4agg

Python version

3.12

Jupyter version

no

Installation

git checkout