Fixes#9357
The main issue was the spread operator using at the wrong place in functions overriding spacing of nodes. The bug, to be visible, required copying AST node before, because during copying `whitespace` field was explicitly set to undefined (in opposite to being unset), what in turns make spread overriding the value set by those functions.
# Important Notes
* To enable VSCode debugging, added a workspace for vitest and fix any relative path to be working-dir independent.
