libc++abi exception when running demo enable/enable/examples/demo/savage/buttons_on_canvas when running python3.11

**Description:**

When running demo [enable/enable/examples/demo/savage/buttons_on_canvas](https://github.com/enthought/enable/blob/main/enable/examples/demo/savage/buttons_on_canvas.py), a exception will happen in libc++:
```
2023-04-06 11:25:18.884 Python[3819:77967] ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to /var/folders/2z/kylzj9s92y71cxscmljmpqrh0000gt/T/org.python.python.savedState
libc++abi: terminating with uncaught exception of type kiva::$_0
zsh: abort python3.11 enable/examples/demo/savage/buttons_on_canvas.py
```

**Replication step:**
python enable/examples/demo/savage/buttons_on_canvas.py

**Environment:**
MacOS, python3.11 or python3.8 (with or without EDM)

**Packages Installed:**
```
Package Version Editable project location
------------------ ----------- --------------------------------------
chaco 5.1.0 /Users/cyliu/Documents/3.11_test/chaco
configobj 5.0.8
enable 5.4.0.dev32
fonttools 4.39.2
joblib 1.2.0
numpy 1.24.2
pandas 1.5.3
Pillow 9.4.0
pip 22.3.1
PyAudio 0.2.13
pyface 7.4.4
pygarrayimage 1.0
pyglet 2.0.5
Pygments 2.14.0
pyparsing 3.0.9
PySide6 6.4.3
PySide6-Addons 6.4.3
PySide6-Essentials 6.4.3
python-dateutil 2.8.2
pytz 2023.2
reportlab 3.6.12
scikit-learn 1.2.2
scipy 1.10.1
setuptools 65.6.3
shiboken6 6.4.3
six 1.16.0
threadpoolctl 3.1.0
traits 6.4.1
traitsui 8.0.0.dev0
```