This is just a character, and so it seems clearer to refer to it specifically when we want to know if a character is a newline. There was only one case where we relied on Newline being different from Whitespace, and we special-cased that instance. Changing this actually makes us match the behavior of VS Code when double-clicking runs of multiple newlines.

/cc @as-cii

Co-Authored-By: Keith Simmons <keith@the-simmons.net>