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b3f0c85d82
On some cases during serialization (like with headings), the previous
node is still "open" when it's the "turn" of the node we're serializing.
In this case, checking the boundaries before writing was getting the
wrong state, because the `write` call uses `flushClose()`, which makes
sure we have the newlines from closing the previous node.
This would create scenarios like (notice the space before each node
below the heading)
```markdown
# Heading
🎉
# Heading
@mention
# Heading
#hashtag
```
This PR makes sure we call flushClose() before checking boundaries, and
adds tests for that.