Hitting a breakpoint opens a new instance of the file

[alexandre-perrin]

I am hitting an issue occurring at the moment on only one file in my project.
When I launch a debug session with a break point on this specific file, the debugger opens a new tab each time the debugger breaks.

Environment data

VS Code version: 1.95.3
Extension version (available under the Extensions sidebar): v2024.12.0
OS and version: Kubuntu 22.04
Python version (& distribution if applicable, e.g. Anaconda): Python 3.10.12
Type of virtual environment used (N/A | venv | virtualenv | conda | ...): venv or none, same issue

Test with pytest and pyfakefs

Expected behaviour

When hitting a breakpoint during debug, the corresponding line in the already opened source file should be highlighted

Actual behaviour

A new tab is opened with the file with breakpoint, then opens a new tab for each debug step.

[alexandre-perrin]

One more thing I just noticed, this occurs only with usage of pyfakefs pytest plugin...

It could be related that the file system gets mocked and alters the behaviour of the debugger.

[rchiodo]

Yes pyfakefs would cause the debugger to think the actual file doesn't exist because pyfakefs is rewiring the file system.

See these issues for more information:
#1709
#267