UP032 does not cleanup escaped format placeholders in string continuations

[ThiefMaster]

Original code:

query = ('type != {} OR '
         "data::text = '{{}}'"
         .format(my_type))

$ ruff --isolated --select UP032 --preview rufftest/ruff_sample.py
rufftest/ruff_sample.py:1:10: UP032 [*] Use f-string instead of `format` call

$ ruff --isolated --select UP032 --preview rufftest/ruff_sample.py --fix
Found 1 error (1 fixed, 0 remaining).

"Fixed" code:

query = (f'type != {my_type} OR '
         "data::text = '{{}}'"
         )

Weird whitespace aside, the second string now contains a literal {{}} instead of the previous {} after formatting.

Any escaped {{}} format placeholders in string parts not converted to an f-string should be replaced with their unescaped version {}

[Skylion007]

We just realized we hit the same bug in PyTorch with ruff a while back when we updated.

[charliermarsh]

I thought this was filed before and fixed — will look into it!

[zanieb]

Here's a failing test case #8697

[Skylion007]

f'"args": {{}}}}, '
is what broke for me.