Currently the spec says that snippets can use "tab stops and placeholders", where a tabstop looks like $1 and a placeholder looks like ${1:foo}.

It also says that "$0 defines the final tab stop" but it does not make it clear whether $0 can be used with placeholder text (like ${0:foo}).

Using it like this works fine in VS Code (it treats it as a final tabstop and a placeholder, so the text is selected and snippet mode is exited), however nevoim's LSP client is behaving differently and it could be argued that the spec doesn't say that $0 is allowed to be a placeholder.

@dbaeumer assuming VS Code's behaviour is desired, I can send a PR to change:

$0 defines the final tab stop

to

$0 defines the final tab stop or placeholder

Does this seem reasonable?