make CollabLineBreakNode respect type

[mharris717]

Description

Describe the changes in this pull request

Closes #

Test plan

Before

Insert relevant screenshots/recordings/automated-tests

After

Insert relevant screenshots/recordings/automated-tests

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[etrepum]

What is the purpose of this PR? There's no clear reason why you would want to do this, and no tests to show that it does anything useful. LineBreakNode isn't really intended to be subclassed or overridden.

[mharris717]

Apologies, somehow I neglected to create this as a draft PR, intended to add that info before anyone had to look at it. Will add reasons shortly.