NotImplementedError: the qt traitsui.qt backend doesn't implement scrubber_editor:_ScrubberEditor when running traitsui/examples/demo/Advanced/Scrubber_editor_demo.py

[homosapien-lcy]

Problem description:
When trying to run demo traitsui/examples/demo/Advanced/Scrubber_editor_demo.py, a NotImplementedError: the qt traitsui.qt backend doesn't implement scrubber_editor:_ScrubberEditor will raise

Replication:

python3.11 traitsui/examples/demo/Advanced/Scrubber_editor_demo.py

Setup:
MacOS, python3.11

Package:
Package Version Editable project location

---

apptools 5.2.0
attrdict 2.0.1
attrdict3 2.0.2
blosc2 2.0.0
celiagg 2.1.3
certifi 2022.12.7
chaco 5.1.0 /Users/cyliu/Documents/3.11_test/chaco
charset-normalizer 3.1.0
configobj 5.0.8
cPython 0.0.6
Cython 0.29.34
dnspython 2.3.0
enable 5.4.0.dev45 /Users/cyliu/Documents/3.11_test/enable
fonttools 4.39.2
h5py 3.8.0
idna 3.4
joblib 1.2.0
msgpack 1.0.5
numexpr 2.8.4
numpy 1.24.2
packaging 23.1
pandas 1.5.3
Pillow 9.4.0
pip 23.1
py-cpuinfo 9.0.0
PyAudio 0.2.13
pyface 8.0.0
pygarrayimage 1.0
pyglet 2.0.5 /Users/cyliu/Documents/3.11_test/pyglet
Pygments 2.14.0
pymongo 4.3.3
pyparsing 3.0.9
PySide6 6.4.3
PySide6-Addons 6.4.3
PySide6-Essentials 6.4.3
python-dateutil 2.8.2
pythonw 3.0.3
pytz 2023.2
reportlab 3.6.12
requests 2.28.2
scikit-learn 1.2.2
scipy 1.10.1
setuptools 65.6.3
shiboken6 6.4.3
six 1.16.0
tables 3.8.0
threadpoolctl 3.1.0
traits 7.0.0.dev1854 /Users/cyliu/Documents/3.11_test/traits
traitsui 8.0.0.dev0 /Users/cyliu/Documents/3.11_test/traitsui
urllib3 1.26.15
wxPython 4.2.0

[homosapien-lcy]

After discussing with Didrik, the _ScrubberEditor may only be supposed to run with wx, but it is not explicitly pointed out in the file, so we will do that in a PR.