Python tkinter applications fail with "append_pending_request: Assertion `!xcb_xlib_unknown_seq_number' failed."

What were you trying to do?

Start a python application which creates a dialog box with turtle.textinput (i.e., tkinter.simpledialog)

What steps did you take to trigger the issue?

Start the following code with Mu:

from turtle import textinput
a = textinput("Title", "Input")

What did you expect to happen?

A textinput field with title "Title" should ask the user for "Input".

What actually happened?

The application crashes with the following output:

[xcb] Unknown sequence number while appending request
[xcb] You called XInitThreads, this is not your fault
[xcb] Aborting, sorry about that.
python: ../../src/xcb_io.c:157: append_pending_request: Assertion `!xcb_xlib_unknown_seq_number' failed.

---------- FINISHED ----------
exit code: 6 status: 1

Operating System Version

Ubuntu 23.10 (Mantic)

Mu Version

1.2.0

Other Info

Note that the same code works when the file is directly called with python or run with another IDE such as PyCharms.
echo $XDG_SESSION_TYPE yields wayland

Editor Log

2024-01-30 07:03:00,289 - root:283(run) INFO:

Starting Mu 1.2.0 2024-01-30 07:03:00,289 - root:284(run) INFO: uname_result(system='Linux', node='immanuel.fhgr.ch', release='6.5.0-14-generic', version='#14-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 14 14:59:49 UTC 2023', machine='x86_64', processor='x86_64') 2024-01-30 07:03:00,293 - root:285(run) INFO: Platform: Linux-6.5.0-14-generic-x86_64-with-glibc2.2.5 2024-01-30 07:03:00,293 - root:286(run) INFO: Python path: ['/tmp/.mount_Mu_Ediotdi4W/usr/lib/python38.zip', '/tmp/.mount_Mu_Ediotdi4W/usr/lib/python3.8', '/tmp/.mount_Mu_Ediotdi4W/usr/lib/python3.8/lib-dynload', '/tmp/.mount_Mu_Ediotdi4W/usr/lib/python3.8/site-packages'] 2024-01-30 07:03:00,293 - root:287(run) INFO: Language code: en_US 2024-01-30 07:03:00,294 - mu.settings:220(load) WARNING: No settings file found at /home/albert/.local/share/mu/settings.json; skipping 2024-01-30 07:03:00,295 - root:312(run) INFO: Wayland detected, setting QT_QPA_PLATFORM=wayland 2024-01-30 07:03:00,817 - mu.virtual_environment:619(ensure_and_create) INFO: Added log handler. 2024-01-30 07:03:00,817 - mu.virtual_environment:630(ensure_and_create) DEBUG: Checking virtual environment; attempt #1. 2024-01-30 07:03:00,818 - mu.virtual_environment:719(ensure_path) INFO: Virtual Environment found at: /home/albert/.local/share/mu/mu_venv-38-20240130-064515 2024-01-30 07:03:00,818 - mu.virtual_environment:740(ensure_interpreter) INFO: No interpreter found at: /home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python 2024-01-30 07:03:00,819 - mu.virtual_environment:750(ensure_interpreter) INFO: Symlinked /home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python to AppImage's /tmp/.mount_Mu_Ediotdi4W/usr/bin/python3.8 2024-01-30 07:03:00,819 - mu.virtual_environment:463(run_subprocess) INFO: Running ('/home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python', '-c', 'import sys; print("%s%s" % sys.version_info[:2])') with kwargs {'shell': False} 2024-01-30 07:03:00,941 - mu.virtual_environment:475(run_subprocess) DEBUG: Process returned 0; output: 38 2024-01-30 07:03:00,941 - mu.virtual_environment:786(ensure_interpreter_version) INFO: Both interpreters at version 38 2024-01-30 07:03:00,942 - mu.virtual_environment:815(ensure_pip) INFO: Pip found at: /home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/pip 2024-01-30 07:03:00,942 - mu.virtual_environment:798(ensure_key_modules) DEBUG: Verifying import of: pgzero 2024-01-30 07:03:00,942 - mu.virtual_environment:463(run_subprocess) INFO: Running ('/home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python', '-c', 'import pgzero') with kwargs {'shell': False} 2024-01-30 07:03:01,021 - mu.virtual_environment:475(run_subprocess) DEBUG: Process returned 0; output: No output received. 2024-01-30 07:03:01,021 - mu.virtual_environment:798(ensure_key_modules) DEBUG: Verifying import of: flask 2024-01-30 07:03:01,021 - mu.virtual_environment:463(run_subprocess) INFO: Running ('/home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python', '-c', 'import flask') with kwargs {'shell': False} 2024-01-30 07:03:01,838 - mu.virtual_environment:475(run_subprocess) DEBUG: Process returned 0; output: No output received. 2024-01-30 07:03:01,839 - mu.virtual_environment:798(ensure_key_modules) DEBUG: Verifying import of: ipykernel 2024-01-30 07:03:01,839 - mu.virtual_environment:463(run_subprocess) INFO: Running ('/home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python', '-c', 'import ipykernel') with kwargs {'shell': False} 2024-01-30 07:03:03,342 - mu.virtual_environment:475(run_subprocess) DEBUG: Process returned 0; output: No output received. 2024-01-30 07:03:03,342 - mu.virtual_environment:798(ensure_key_modules) DEBUG: Verifying import of: ipython_genutils 2024-01-30 07:03:03,342 - mu.virtual_environment:463(run_subprocess) INFO: Running ('/home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python', '-c', 'import ipython_genutils') with kwargs {'shell': False} 2024-01-30 07:03:03,427 - mu.virtual_environment:475(run_subprocess) DEBUG: Process returned 0; output: No output received. 2024-01-30 07:03:03,428 - mu.virtual_environment:662(ensure_and_create) INFO: Valid virtual environment found at /home/albert/.local/share/mu/mu_venv-38-20240130-064515 2024-01-30 07:03:03,432 - mu.settings:169(save) DEBUG: Saving to /home/albert/.local/share/mu/venv.json 2024-01-30 07:03:03,480 - mu.logic:777(init) INFO: Setting up editor. 2024-01-30 07:03:03,488 - mu.logic:801(init) INFO: Log directory: /home/albert/.cache/mu/log 2024-01-30 07:03:03,489 - mu.logic:802(init) INFO: Data directory: /home/albert/.local/share/mu 2024-01-30 07:03:03,489 - mu.logic:816(setup) INFO: Available modes: python, snek, circuitpython, microbit, esp, web, pyboard, debugger, pygamezero, lego, pico 2024-01-30 07:03:03,490 - mu.modes.base:61(get_default_workspace) INFO: Using workspace /home/albert/mu_code from settings file 2024-01-30 07:03:03,654 - mu.modes.base:61(get_default_workspace) INFO: Using workspace /home/albert/mu_code from settings file 2024-01-30 07:03:03,655 - mu.logic:1583(change_mode) INFO: Workspace directory: /home/albert/mu_code 2024-01-30 07:03:03,655 - mu.logic:890(restore_session) DEBUG: <SessionSettings from /home/albert/.local/share/mu/session.json> 2024-01-30 07:03:03,674 - mu.logic:1015(_load) INFO: Loading script from: /home/albert/tmp/test.py 2024-01-30 07:03:03,675 - mu.logic:332(read_and_decode) DEBUG: Trying to decode with utf-8 2024-01-30 07:03:03,676 - mu.logic:335(read_and_decode) INFO: Decoded with utf-8 2024-01-30 07:03:03,677 - mu.logic:348(read_and_decode) DEBUG: Detected newline '\n' 2024-01-30 07:03:03,677 - mu.logic:1114(_load) DEBUG: # Write your code here :-) from turtle import textinput a = textinput("Example", "Application")

2024-01-30 07:03:04,218 - mu.logic:912(restore_session) INFO: Loaded files. 2024-01-30 07:03:04,218 - mu.logic:918(restore_session) INFO: User defined environment variables: {} 2024-01-30 07:03:04,218 - mu.logic:923(restore_session) INFO: Minify scripts on micro:bit? False 2024-01-30 07:03:04,285 - mu.modes.base:61(get_default_workspace) INFO: Using workspace /home/albert/mu_code from settings file 2024-01-30 07:03:04,285 - mu.logic:1583(change_mode) INFO: Workspace directory: /home/albert/mu_code 2024-01-30 07:03:06,785 - mu.modes.python3:230(run_script) INFO: About to run script: {'interpreter': '/home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python', 'script_name': '/home/albert/tmp/test.py', 'working_directory': '/home/albert/tmp', 'interactive': True, 'envars': {}} 2024-01-30 07:03:06,810 - mu.interface.main:780(add_python3_runner) INFO: About to start_process: '/home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python', '/home/albert/tmp/test.py', '/home/albert/tmp', True, False, None, {}, None 2024-01-30 07:03:06,810 - mu.interface.panes:1073(start_process) INFO: Running script: /home/albert/tmp/test.py 2024-01-30 07:03:06,811 - mu.interface.panes:1074(start_process) INFO: Using interpreter: /home/albert/.local/share/mu/mu_venv-38-20240130-064515/bin/python 2024-01-30 07:03:06,811 - mu.interface.panes:1076(start_process) INFO: Running with interactive mode. 2024-01-30 07:03:06,811 - mu.interface.panes:1079(start_process) INFO: Command args: [] 2024-01-30 07:03:06,811 - mu.interface.panes:1101(start_process) INFO: Working directory: /home/albert/tmp 2024-01-30 07:03:06,812 - mu.interface.panes:1105(start_process) INFO: Python path: ['/tmp/.mount_Mu_Ediotdi4W/usr/lib/python38.zip', '/tmp/.mount_Mu_Ediotdi4W/usr/lib/python3.8', '/tmp/.mount_Mu_Ediotdi4W/usr/lib/python3.8/lib-dynload', '/tmp/.mount_Mu_Ediotdi4W/usr/lib/python3.8/site-packages'] 2024-01-30 07:03:06,812 - mu.interface.panes:1135(start_process) INFO: Args: ['-i', '/home/albert/tmp/test.py']

mu-editor / mu