stubgen: Class docstring not included in stub when combining `--include-docstrings` with `--inspect-mode`

Bug Report

I'm using stubgen to generate stubs for an untyped package. Because the docstrings are assembled at runtime, I want to include them in the stubs such that IDEs using static type checkers can use them. I therefore invoke stubgen with the --include-docstrings and --inspect-mode parameters. The generated stubs do not include docstrings for classes (i.e., MyClass.__doc__), while docstrings for methods and properties are correctly added to the stubs.

If I remove the --inspect-mode switch, the class docstrings are added to the stubs as expected. But this isn't a viable solution for me, as I need to use inspect mode to generate the full docstrings.

To summarize, there seems to be an interaction between --include-docstrings and --inspect-mode, which causes class docstrings in MyClass.__doc__ to get lost.

To Reproduce

# mwe.py

class MyClass:
    """My test class."""

    def __init__(self):
        pass

    def f(self):
        """My test function."""
        pass

Run:

stubgen --include-docstrings --inspect-mode ./mwe.py

Expected Behavior

The type stub contains the class docstring.

class MyClass:
    """My test class."""
    def __init__(self) -> None: ...
    def f(self) -> None:
        """My test function."""

Actual Behavior

The type stub does not contain the class docstring.

class MyClass:
    def __init__(self) -> None: ...
    def f(self):
        """My test function."""

The expected stub can be produced by omitting the --inspect-mode parameter, i.e., by invoking:

stubgen --include-docstrings ./mwe.py

Your Environment

• Mypy version used: 1.7.0
• stubgen command-line flags: --include-docstrings --inspect-mode
• Python version used: 3.12.0

Run the documented stubgen --include-docstrings --inspect-mode ./mwe.py reproduction and compare it with the invocation without --inspect-mode. Trace the stubgen CLI handling for --include-docstrings and --inspect-mode; done means the generated stub includes MyClass.__doc__ while preserving the existing method docstrings.