Enable supportRestructuredText leads to visible non-breaking space in docstrings

[huaium]

Environment data

• Pylance version: 2025.3.2
• OS and version: macOS 15.3.2
• Python version (& distribution if applicable, e.g. Anaconda): miniconda 24.7.1

Code Snippet

"python.analysis.supportRestructuredText": true

Repro Steps

Taking ThreadPoolExecutor() as an example:

1. Enable python.analysis.supportRestructuredText (default)
2. Move your mouse over the ThreadPoolExecutor() to show the quick documentation for its init method

Expected behavior

Showing docstrings preview:

...
max_workers: The maximum number of threads that can be used to execute the given calls.
...

Actual behavior

...
max_workers :     The maximum number of threads that can be used to     execute the given calls.
...

Logs

No error logs output in the console after switching to trace log level

More

Since python.analysis.supportRestructuredText is still under experiment, it should be disabled by default.

[rchiodo]

What's weird is that if you go to thread.py, it works fine. Not sure why hovering over an instance causes a difference.

Hover over instance:

Go to the actual __init__ and hover:

[rchiodo]

It looks like it's skipping the restructured parser but only this init case.