Flatmenu demo crashes on Linux

[emersonrp]

Operating system: Manjaro Linux
wxPython version & source: 4.2.1 from Manjaro extra
Python version & source: 3.12.4 from Manjaro core

Description of the problem:

Clicking on the "Test Flatmenu" button in the Flatmenu demo panel fails with the following traceback:

Traceback (most recent call last):
  File "agw/FlatMenu.py", line 851, in OnButton
    self.win = FlatMenuDemo(self, self.log)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "agw/FlatMenu.py", line 229, in __init__
    self.ConnectEvents()
  File "agw/FlatMenu.py", line 506, in ConnectEvents
    self.Bind(FM.EVT_FLAT_MENU_SELECTED, self.OnEdit, id=MENU_DISABLE_MENU_ITEM, id2=MENU_REMOVE_MENU)
  File "/usr/lib/python3.12/site-packages/wx/core.py", line 1483, in _EvtHandler_Bind
    event.Bind(self, id, id2, handler)
  File "/usr/lib/python3.12/site-packages/wx/core.py", line 1554, in Bind
    target.Connect(id1, id2, et, function)
wx._core.wxAssertionError: C++ assertion "idLast == wxID_ANY || winid <= idLast" failed at /usr/src/debug/wxwidgets/wxWidgets/include/wx/event.h(3478) in wxEventTableEntryBase(): invalid IDs range: lower bound > upper bound

[reticulatus]

The demo runs without crashing when using wxPython 4.2.1 + Python 3.10.12 + Linux Mint 21.3.

[infinity77]

The FlatMenu code creates the two menu items IDs in a sequence, one after the other:

MENU_DISABLE_MENU_ITEM = wx.NewIdRef()
MENU_REMOVE_MENU = wx.NewIdRef()

My understanding is that MENU_REMOVE_MENU > MENU_DISABLE_MENU_ITEM. It is like that on Windows, and apparently it is like that on Linus as well per @reticulatus message.

Can it be a quirk of Python 3.12? No clue.