Parens of parenthesized context managers are removed in some cases, even when targeting 3.9+

[yilei]

Before:

with (
      mock.patch.object(
          self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True
      ),
      mock.patch.object(
          self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True, return_value="xxxx"
      )
  ):
    pass


with (
      mock.patch.object(
          self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True
      ) as a,
      mock.patch.object(
          self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True, return_value="xxxx"
      )
  ):
    pass


with (
      mock.patch.object(
          self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True
      ),
      mock.patch.object(
          self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True, return_value="xxxx"
      ) as b
  ):
    pass


with (
      mock.patch.object(
          self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True
      ),
      mock.patch.object(
          self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True, return_value="xxxx"
      ),
  ):
    pass

After:

with mock.patch.object(self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True), mock.patch.object(
    self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True, return_value="xxxx"
):
    pass


with mock.patch.object(
    self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True
) as a, mock.patch.object(
    self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True, return_value="xxxx"
):
    pass


with (
    mock.patch.object(self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True),
    mock.patch.object(
        self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True, return_value="xxxx"
    ) as b,
):
    pass


with (
    mock.patch.object(self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True),
    mock.patch.object(
        self.xxx_xxxxxx, "xxxxxxxxxx", autospec=True, return_value="xxxx"
    ),
):
    pass

Playground link.

I'll work on a fix.