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Может ли кто-нибудь объяснить, почему пользовательский обработчик событий перестает вызываться при отображении диалогового окна сообщения?

 import threading
import time
import wx
from wx.lib.newevent import NewEvent


CustomEvent, EVT_CUSTOM = NewEvent()


class EventProducer(threading.Thread):
    def __init__(self, consumer):
        self.running = True
        self._consumer = consumer
        self._production_count = 0
        super().__init__(daemon=True)
        
    def run(self):
        while self.running:
            data_string = f'Test Data:{self._production_count}'
            print(f'Producing Event: {data_string}')
            event = CustomEvent(data=data_string)
            wx.PostEvent(self._consumer, event)
            self._production_count  = 1
            time.sleep(0.5)
            
            
class TestPanel(wx.Panel):
    def __init__(self, parent):
        super().__init__(parent)
        self.button_id = wx.NewIdRef()      
        self._button = wx.Button(self, id=self.button_id, label='Test Button')
        sizer = wx.BoxSizer(wx.HORIZONTAL)
        sizer.Add(selenter code heref._button, proportion=1, flag=wx.EXPAND)
        self.SetSizer(sizer)
        
        self.Bind(EVT_CUSTOM, self._handle_custom_event)
        self.Bind(wx.EVT_BUTTON, self._handle_button_event, id=self.button_id)
        self._producer = EventProducer(self)
                
    def _handle_custom_event(self, event):
        print(f'tConsuming Event: {event.data}')
        
    def _handle_button_event(self, event):
        dlg = wx.MessageDialog(self, 'Test Message', 'Test Message')
        dlg.ShowModal()

    def start_events(self):
        self._producer.start()


class MainFrame(wx.Frame):
    def __init__(self):
        super().__init__(None, title='Test Frame')
        self._panel = TestPanel(self)
        sizer = wx.BoxSizer(wx.HORIZONTAL)
        sizer.Add(self._panel, proportion=1, flag=wx.EXPAND)
        self.SetSizer(sizer)
        
        self._panel.start_events()
        
class App(wx.App):
    def __init__(self):
        super().__init__()
        self._frame = None
        
    def OnInit(self):
        self._frame = MainFrame()
        self._frame.Show()
        return True


if __name__ == '__main__':
    app = App()
    app.MainLoop()
 

Затем выведите данные из программы:

 Producing Event: Test Data:0
    Consuming Event: Test Data:0
Producing Event: Test Data:1
    Consuming Event: Test Data:1
Producing Event: Test Data:2
    Consuming Event: Test Data:2
Producing Event: Test Data:3
    Consuming Event: Test Data:3
Producing Event: Test Data:4
    Consuming Event: Test Data:4
Producing Event: Test Data:5
    Consuming Event: Test Data:5
Producing Event: Test Data:6
    Consuming Event: Test Data:6
 

При нажатии кнопки и отображении диалогового окна сообщения дескриптор события пользовательского события перестает вызываться. Он действительно вызывается, когда мышь перемещается по основному кадру, как показано ниже. Если мышь полностью отодвинута от кадра, дескриптор события вообще перестает вызываться.

 Producing Event: Test Data:7
Producing Event: Test Data:8
    Consuming Event: Test Data:7
    Consuming Event: Test Data:8
Producing Event: Test Data:9
Producing Event: Test Data:10
    Consuming Event: Test Data:9
    Consuming Event: Test Data:10
Producing Event: Test Data:11
Producing Event: Test Data:12
Producing Event: Test Data:13
Producing Event: Test Data:14
Producing Event: Test Data:15
Producing Event: Test Data:16
    Consuming Event: Test Data:11
    Consuming Event: Test Data:12
    Consuming Event: Test Data:13
    Consuming Event: Test Data:14
    Consuming Event: Test Data:15
    Consuming Event: Test Data:16
Producing Event: Test Data:17
Producing Event: Test Data:18
Producing Event: Test Data:19
Producing Event: Test Data:20
Producing Event: Test Data:21
Producing Event: Test Data:22
Producing Event: Test Data:23
    Consuming Event: Test Data:17
    Consuming Event: Test Data:18
    Consuming Event: Test Data:19
    Consuming Event: Test Data:20
    Consuming Event: Test Data:21
    Consuming Event: Test Data:22
    Consuming Event: Test Data:23
Producing Event: Test Data:24
    Consuming Event: Test Data:24
Producing Event: Test Data:25
    Consuming Event: Test Data:25