Another regression in URL join behavior

[gmacon]

Describe the bug

Joining a path onto an existing URL no longer preserves a trailing slash in the last component.

To Reproduce

#!/usr/bin/env python3

from yarl import URL

single = URL("http://example.com/dir/")
combined = URL("http://example.com") / "dir/"
print(f"single: {single}")
print(f"combined: {combined}")
assert str(single) == str(combined)

Expected behavior

The trailing slash should be preserved.

Logs/tracebacks

$ ./regress.py
single: http://example.com/dir/
combined: http://example.com/dir
Traceback (most recent call last):
  File "./regress.py", line 9, in <module>
    assert str(single) == str(combined)
AssertionError

Python Version

$ python --version
Python 3.8.13

multidict Version

$ python -m pip show multidict
Name: multidict
Version: 6.0.4
Summary: multidict implementation
Home-page: https://github.com/aio-libs/multidict
Author: Andrew Svetlov
Author-email: andrew.svetlov@gmail.com
License: Apache 2
Location: /Users/gmacon3/code/github.com/aio-libs/yarl/venv/lib/python3.8/site-packages
Requires:
Required-by: yarl

yarl Version

$ python -m pip show yarl
Name: yarl
Version: 1.9.2
Summary: Yet another URL library
Home-page: https://github.com/aio-libs/yarl/
Author: Andrew Svetlov
Author-email: andrew.svetlov@gmail.com
License: Apache-2.0
Location: /home/vagrant/venv/lib/python3.8/site-packages
Requires: idna, multidict
Required-by: aiohttp, apiary-client, apiary-messages

OS

RHEL 7

Additional context

I bisected this to 2dac93f, which I note is the same commit that caused #854 reporting a different regression related to joined URLs.

Code of Conduct

• I agree to follow the aio-libs Code of Conduct

[dann-romm]

in addition,

MAIN_URL = 'example.com'

SECOND_URL = (MAIN_URL / 'some_path/').with_query(
    'some_variable=1'
)

SECOND_URL
expected example.com/some_path/?some_variable=1
got example.com/some_path?some_variable=1

[dimaqq]

Release, please? 🙏🏻

[DanielNoord]

Gentle ping on this release. This regression breaks both 1.9.0 and 1.9.1. We'd like not to pin yarl as it used in so many other dependencies.