wx: tab cannot jump between groups

[greschd]

When using the wx backend, the Tab key to switch between input fields does not work as expected. In particular, it does not (always) move between groups.

See the following example:

With the qt backend:

Recording.2023-08-24.081958.mp4

With wx:

Recording.2023-08-24.082517.mp4

Note how the cursor can jump out of the tabbed group, but not back in. It also never reaches the OK and Cancel buttons.

Example code:

from traits.etsconfig.api import ETSConfig
ETSConfig.toolkit = 'wx'
# ETSConfig.toolkit = 'qt'

from traits.api import HasTraits, Str
from traitsui.api import View, Item, Group, Tabbed


class Test(HasTraits):
    foo = Str()
    bar = Str()

test_view = View(
    Group(
        Item('foo'),
        Item('bar'),
        Tabbed(
            Group(
                Item('foo'),
                Item('bar'),
            ),
            Group(
                Item('foo'),
                Item('bar'),
            ),
        ),
    ),
    buttons=['OK', 'Cancel'],
    resizable=True,
)

test = Test()
test.configure_traits(view=test_view)

The cursor never reaching the buttons is also reproducible without Group or Tabbed:

test_view = View(
    Item('foo'),
    Item('bar'),
    buttons=['OK', 'Cancel'],
    resizable=True,
)

Tested on Windows with:

numpy==1.25.2
Pillow==9.5.0
pyface==8.0.0
Pygments==2.16.1
PyQt6==6.5.2
PyQt6-Qt6==6.5.2
PyQt6-sip==13.5.2
six==1.16.0
traits==6.4.2
traitsui==8.0.0
wxPython==4.2.1

May be related to #1461 (comment)