This change fixes an issue where glob patterns like `{a,ab}` would not
match `ab` because the first option `a` matches, then the end of the
string is expected but `b` is found, and LPeg does not backtrack to try
the next option `ab` which would match. The fix here is to also append
the rest of the pattern to the generated LPeg pattern for each option.
This changes a glob `{a,ab}` from being parsed as
("a" or "ab") "end of string"
to
("a" "end of string" or "ab" "end of string")
Here, matching against `ab` would try the first option, fail to match,
then proceed to the next option, and match.
The sacrifice this change makes is dropping support for nested `{}`
conditions, which VSCode doesn't seem to support or test AFAICT.
Fixes#28931
Co-authored-by: Sergey Slipchenko <faergeek@gmail.com>
4bd86120d4