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615337a54d
## Summary
This PR moves the "insert empty lines" behavior out of
`JoinNodesBuilder` and into the `Suite` formatter. I find it a little
confusing that the logic is split between those two formatters right
now, and since this is _only_ used in that one place, IMO it is a bit
simpler to just inline it and use a single approach to tracking state
(right now, both are stateful).
The only other place this was used was for decorators. As a side effect,
we now remove blank lines in both of these cases, which is a known but
intentional deviation from Black (which preserves the empty line before
the comment in the first case):
```python
@foo
# Hello
@bar
def baz():
pass
@foo
@bar
def baz():
pass
```
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|---|---|---|
| .. | ||
| mod.rs | ||
| stmt_ann_assign.rs | ||
| stmt_assert.rs | ||
| stmt_assign.rs | ||
| stmt_async_for.rs | ||
| stmt_async_function_def.rs | ||
| stmt_async_with.rs | ||
| stmt_aug_assign.rs | ||
| stmt_break.rs | ||
| stmt_class_def.rs | ||
| stmt_continue.rs | ||
| stmt_delete.rs | ||
| stmt_expr.rs | ||
| stmt_for.rs | ||
| stmt_function_def.rs | ||
| stmt_global.rs | ||
| stmt_if.rs | ||
| stmt_import.rs | ||
| stmt_import_from.rs | ||
| stmt_match.rs | ||
| stmt_nonlocal.rs | ||
| stmt_pass.rs | ||
| stmt_raise.rs | ||
| stmt_return.rs | ||
| stmt_try.rs | ||
| stmt_try_star.rs | ||
| stmt_type_alias.rs | ||
| stmt_while.rs | ||
| stmt_with.rs | ||
| suite.rs | ||