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author	Yilei "Dolee" Yang <yileiyang@google.com>
	Sun, 22 Jan 2023 13:27:11 +0000 (05:27 -0800)
committer	GitHub <noreply@github.com>
	Sun, 22 Jan 2023 13:27:11 +0000 (05:27 -0800)
commit	a36878eb2f375e2ac1e13052f663909f3835ec46
tree	325038cb814e88ed1340a5730a40a531ac64a544	tree \| snapshot
parent	eabff673b37c5430d4cf72fa050a189a57be2deb	commit \| diff

Fix an invalid quote escaping bug in f-string expressions (#3509)

Fixes #3506

We can't simply escape the quotes in a naked f-string when merging string groups, because backslashes are invalid.

The quotes in f-string expressions should be toggled (this is safe since quotes can't be reused).

This fix also means implicitly concatenated f-strings with different quotes can now be merged or quote-normalized by changing the quotes used in expressions. e.g.:

```diff
         raise sa_exc.UnboundExecutionError(
             "Could not locate a bind configured on "
-            f'{", ".join(context)} or this Session.'
+            f"{', '.join(context)} or this Session."
         )
```

CHANGES.md		diff \| blob \| history
src/black/trans.py		diff \| blob \| history
tests/data/preview/long_strings__regression.py		diff \| blob \| history

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