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## Summary
This PR fixes the bug in the lexer where the `Mode::Ipython` wasn't
being considered when initializing the soft keyword transformer which
wraps the lexer. This means that if the source code starts with either
`match` or `type` keyword, then the keywords were being considered as
name tokens instead. For example,
```python
match foo:
case bar:
pass
```
This would transform the `match` keyword into an identifier if the mode
is `Ipython`.
The fix is to reverse the condition in the soft keyword initializer so
that any new modes are by default considered as the lexer being at start
of line.
## Test Plan
Add a new test case for `Mode::Ipython` and verify the snapshot.
fixes: #8870
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