Closed
Description
Where there's an f-string that has a debug expression in the last line of a file, the debug expression buffer is one character too short. For example:
```python3
cpython on main via C v14.0.3-clang via 🐍 pyenv 3.11.3 took 15s
❯ cat tmp/t.py
print(f'''{
3
=}''')%
cpython on main via C v14.0.3-clang via 🐍 pyenv 3.11.3
❯ ./python.exe tmp/t.py
3
3
A fix is already up as part of gh-105828, so just opening this to track the issue.