subprocess.Popen: warnings.warn() calls missing stacklevel=2

[stef41]

Both warnings.warn() calls in subprocess.Popen.__init__ are missing stacklevel=2:

1. POSIX path (line 915): Warning when pass_fds overrides close_fds
2. Windows path (line 1569): Warning when startupinfo.lpAttributeList['handle_list'] overrides close_fds

Without stacklevel=2, the warning points to an internal line inside subprocess.py rather than the caller's Popen() invocation, making it harder for users to locate the source.

PR: #148400

Linked PRs

• gh-148402: show caller's location of subprocess.Popen's warnings #148400

[picnixz]

Can you show us an example please (just for posterity, so that readers can see what happens and how it's going to be fixed)