VSCode Formatting seems to strip trailing newline in files

Using the vscode extension the formatting conflicts with what `refmt.exe` outputs. As `refmt.exe` appends a newline at the end of file whereas this extension does not and in fact strips it away if it exists.

Start by reproducing formatting through the VSCode extension and compare its output with refmt.exe, focusing on whether the final newline is preserved. Done means the extension retains or adds the trailing newline so its formatted output matches refmt.exe.

Written by the indexing model from the issue text.