Code render glitch when navigating history in Terminal

[MCarzolio2]

Type: Bug

Behaviour

Using arrows to navigate history in a Terminal breaks the code rendering. This happens in interactive Python that is launched using shift + enter on highlighted code.

I've noticed that this issue only happens if the $PYTHONSTARTUP variable is set to pythonrc.py. Unsetting this variable launches a well-behaved Python session.

Steps to reproduce:

1. Send code to Terminal using shift + enter.
2. Navigate to the Terminal.
3. Press up arrow to navigate to previous command in history.
4. Observe that code rendering has broken.

Diagnostic data

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

2024-08-26 12:06:00.971 [info] > /opt/homebrew/bin/python3 ~/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/python_files/normalizeSelection.py
2024-08-26 12:06:01.132 [info] > pixi info --json
2024-08-26 12:06:01.132 [info] cwd: /
2024-08-26 12:06:01.168 [warning] failed to determine pixi project information for the interpreter at /opt/homebrew/bin/python3
2024-08-26 12:06:01.169 [info] Send text to terminal: /opt/homebrew/bin/python3
2024-08-26 12:06:01.264 [info] Send text to terminal: print("Hello world")  # First print "Hello world"

2024-08-26 12:06:03.583 [info] > /opt/homebrew/bin/python3 ~/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/python_files/normalizeSelection.py
2024-08-26 12:06:03.627 [info] Send text to terminal: print("Goodbye world")  # Then print "Goodbye world"

Extension version: 2024.12.3
VS Code version: Code 1.92.2 (Universal) (fee1edb, 2024-08-14T17:29:30.058Z)
OS version: Darwin arm64 23.6.0
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.12.5
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Global
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

experiments
• enabled: false

Installed Extensions

Extension Name	Extension Id	Version
Black Formatter	ms-python.black-formatter	2024.2.0
GitHub Copilot	GitHub.copilot	1.223.0
GitHub Copilot Chat	GitHub.copilot-chat	0.18.2
JavaScript Debugger	ms-vscode.js-debug	1.92.0
JavaScript Debugger Companion Extension	ms-vscode.js-debug-companion	1.1.3
Jupyter	ms-toolsai.jupyter	2024.7.0
Jupyter Cell Tags	ms-toolsai.vscode-jupyter-cell-tags	0.1.9
Jupyter Keymap	ms-toolsai.jupyter-keymap	1.1.2
Jupyter Notebook Renderers	ms-toolsai.jupyter-renderers	1.0.19
Jupyter Slide Show	ms-toolsai.vscode-jupyter-slideshow	0.1.6
LaTeX Workshop	James-Yu.latex-workshop	10.1.0
Pylance	ms-python.vscode-pylance	2024.8.1
Python	ms-python.python	2024.12.3
Python Debugger	ms-python.debugpy	2024.10.0
Table Visualizer for JavaScript Profiles	ms-vscode.vscode-js-profile-table	1.0.9

System Info

Item	Value
CPUs	Apple M2 (8 x 2400)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	2, 3, 3
Memory (System)	24.00GB (0.05GB free)
Process Argv	--crash-reporter-id 043b3377-a518-47cc-bab5-dec640206c2f
Screen Reader	no
VM	0%

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805cf:30301675
binariesv615:30325510
vsaa593:30376534
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyonecf:30548226
962ge761:30959799
pythongtdpath:30769146
welcomedialogc:30910334
pythonnoceb:30805159
asynctok:30898717
pythonregdiag2:30936856
pythonmypyd1:30879173
h48ei257:31000450
pythontbext0:30879054
accentitlementsc:30995553
dsvsc016:30899300
dsvsc017:30899301
dsvsc018:30899302
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
01bff139:31013167
pythoncenvpt:31062603
a69g1124:31058053
dvdeprecation:31068756
dwnewjupytercf:31046870
2f103344:31071589
impr_priority:31102340
refactort:31108082
pythonrstrctxt:31112756
flighttreat:31119336
wkspc-onlycs-c:31111717
wkspc-ranged-c:31123312
ei213698:31121563

[MCarzolio2]

Screen.Recording.2024-08-26.at.12.13.13.PM.mov

[MCarzolio2]

[meganrogge]

@Tyriar should we close this in favor of #226992?

[Tyriar]

I'm not sure what would have caused this, maybe upgrading to use executeCommand instead of sendText would fix the problem? That's tracked in microsoft/vscode-python#23929

[MCarzolio2]

I'm not sure what would have caused this, maybe upgrading to use executeCommand instead of sendText would fix the problem? That's tracked in microsoft/vscode-python#23929

is there a way I can test this easily?

[Tyriar]

@MCarzolio2 this would need a change in the python extension. You could try make the change there but you'd need to set up development for the extension.