Code coverage breaks when "relative paths" is enabled

[mheguy]

Type: Bug

Behaviour

Python code coverage is partially broken when "relative paths" is used for coverage.
Specifically: the code coverage percentages are shown in the Testing view, but the paths to the files are incorrect, and the gutters of the files do not show coverage information.

Repro Steps

1. git clone https://github.com/psf/requests.git
2. Create a virtual environment then pip install -r requirements.dev.txt
3. Edit pyproject.toml in the following ways:
   Add tool.coverage.run.relative_files = true to the top of the file.
   Change tool.pytest.ini_options.addopts = "--doctest-modules" to tool.pytest.ini_options.addopts = "--cov-config=pyproject.toml"
4. Go to "Testing".
   If applicable, set configure testing for pytest.
5. Don't run the full test suite, just select a single random test and get coverage information for that.

"test coverage" should pop up, hover over any file and you should note that the path is invalid (in Windows). An example of a path: \src\requests\__init__.py. When things are working correctly, you get an absolute path including the drive letter.
Also, if you click on any of the files, VSCode will pop a modal saying that the file could not be found.

The steps above use requests because it was easy to find and clone. The only real requirement to reproduce the issue is to ensure that relative_files is enabled in coverage.

---

Note that the path provided in the tooltip begins with a backslash.

---

Extension version: 2024.16.0
VS Code version: Code 1.94.0 (d78a74bcdfad14d5d3b1b782f87255d802b57511, 2024-10-02T13:08:12.626Z)
OS version: Windows_NT x64 10.0.19045
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.12.6
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Venv
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

testing
• pytestEnabled: true

experiments
• optInto: ["All"]

Installed Extensions

Extension Name	Extension Id	Version
.NET Install Tool	ms-dotnettools.vscode-dotnet-runtime	2.1.7
Bash Beautify	shakram02.bash-beautify	0.1.1
Bash Debug	rogalmic.bash-debug	0.3.9
Bash IDE	mads-hartmann.bash-ide-vscode	1.43.0
Better Jinja	samuelcolvin.jinjahtml	0.20.0
C#	ms-dotnettools.csharp	2.45.25
C# Dev Kit	ms-dotnettools.csdevkit	1.10.18
CodeViz Stat	vizzuhq.code-viz-stat	0.1.4
Coverage Gutters	ryanluker.vscode-coverage-gutters	2.11.1
Cron Explained	tumido.cron-explained	1.3.1
Crontab Syntax Highlight	hogashi.crontab-syntax-highlight	0.0.2
CSharpier - Code formatter	csharpier.csharpier-vscode	1.8.0
Cucumber (Gherkin) Full Support	alexkrechik.cucumberautocomplete	3.0.5
Data Wrangler	ms-toolsai.datawrangler	1.10.0
Dev Containers	ms-vscode-remote.remote-containers	0.388.0
Docker	ms-azuretools.vscode-docker	1.29.3
DotENV	mikestead.dotenv	1.0.1
Error Lens	usernamehw.errorlens	3.20.0
Even Better TOML	tamasfe.even-better-toml	0.19.2
Excel Viewer	GrapeCity.gc-excelviewer	4.2.62
File Downloader	mindaro-dev.file-downloader	1.0.13
GitHub Actions	github.vscode-github-actions	0.27.0
GitHub Copilot	GitHub.copilot	1.235.0
GitHub Copilot Chat	GitHub.copilot-chat	0.21.0
GitHub Pull Requests	GitHub.vscode-pull-request-github	0.98.0
GitLens — Git supercharged	eamodio.gitlens	15.5.1
Hex Editor	ms-vscode.hexeditor	1.10.0
IntelliCode	VisualStudioExptTeam.vscodeintellicode	1.3.1
IntelliCode for C# Dev Kit	ms-dotnettools.vscodeintellicode-csharp	2.1.11
JavaScript Debugger	ms-vscode.js-debug	1.94.0
JavaScript Debugger Companion Extension	ms-vscode.js-debug-companion	1.1.3
Jira and Bitbucket (Atlassian Labs)	atlassian.atlascode	3.0.10
json	ZainChen.json	2.0.2
JSON Crack	AykutSarac.jsoncrack-vscode	2.0.3
JSON Sample From Schema	roymudie.json-sample-from-schema	0.0.6
Jupyter	ms-toolsai.jupyter	2024.9.1
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
k6 for Visual Studio Code	k6.k6	0.6.0
Live Preview	ms-vscode.live-server	0.4.15
markdownlint	DavidAnson.vscode-markdownlint	0.56.0
Mustache	dawhite.mustache	1.1.1
OpenAPI (Swagger) Editor	42Crunch.vscode-openapi	4.29.0
Path Intellisense	christian-kohler.path-intellisense	2.9.0
Project Manager	alefragnani.project-manager	12.8.0
Pylance	ms-python.vscode-pylance	2024.9.2
Python	ms-python.python	2024.16.0
Python Debugger	ms-python.debugpy	2024.10.0
Rainbow CSV	mechatroner.rainbow-csv	3.12.0
Remote - SSH	ms-vscode-remote.remote-ssh	0.115.0
Remote - SSH: Editing Configuration Files	ms-vscode-remote.remote-ssh-edit	0.87.0
Remote - Tunnels	ms-vscode.remote-server	1.5.2
Remote Development	ms-vscode-remote.vscode-remote-extensionpack	0.25.0
Remote Explorer	ms-vscode.remote-explorer	0.4.3
REST Client	humao.rest-client	0.25.1
Ruff	charliermarsh.ruff	2024.50.0
shell-format	foxundermoon.shell-format	7.2.5
ShellCheck	timonwong.shellcheck	0.37.1
Sort Everything	bennycode.sort-everything	1.4.1
Sort JSON objects	richie5um2.vscode-sort-json	1.20.0
Spectral	stoplight.spectral	1.1.2
SQLite Viewer	qwtel.sqlite-viewer	0.7.3
Table Visualizer for JavaScript Profiles	ms-vscode.vscode-js-profile-table	1.0.10
Task Explorer	spmeesseman.vscode-taskexplorer	2.13.2
Todo Tree	Gruntfuggly.todo-tree	0.0.226
VS Code Counter	uctakeoff.vscode-counter	3.6.1
WSL	ms-vscode-remote.remote-wsl	0.88.4
YAML	redhat.vscode-yaml	1.15.0

System Info

Item	Value
CPUs	12th Gen Intel(R) Core(TM) i7-12800H (20 x 2803)
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 vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.64GB (9.52GB free)
Process Argv	. --crash-reporter-id c80b1e20-df75-4f9f-b510-9dec02122299
Screen Reader	no
VM	0%

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492:30256859
vscod805cf:30301675
binariesv615:30325510
vsaa593:30376534
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
962ge761:30959799
pythongtdpath:30769146
welcomedialog:30910333
pythonnoceb:30805159
asynctok:30898717
pythonmypyd1:30879173
2e7ec940:31000449
pythontbext0:30879054
accentitlementst:30995554
dsvsc016:30899300
dsvsc017:30899301
dsvsc018:30899302
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
945dj816:31013170
a69g1124:31058053
dvdeprecation:31068756
dwnewjupytercf:31046870
impr_priority:31102340
nativerepl1:31139838
refactort:31108082
pythonrstrctxt:31112756
flighttreat:31134774
wkspc-onlycs-t:31132770
nativeloc2:31134642
wkspc-ranged-t:31151552
cf971741:31144450
autoexpandse:31146404
iacca1:31150322
notype1cf:31151524
5fd0e150:31146321

[eleanorjboyd]

Thank you for the detailed report! I will investigate