Expand values inside find_factors_group function

Author: marcosboger

src/tox/config/loader/ini/factor.py

@@ -64,6 +64,7 @@ def expand_factors(value: str) -> Iterator[tuple[list[list[tuple[str, bool]]] |
 
 def find_factor_groups(value: str) -> Iterator[list[tuple[str, bool]]]:
     """Transform '{py,!pi}-{a,b},c' to [{'py', 'a'}, {'py', 'b'}, {'pi', 'a'}, {'pi', 'b'}, {'c'}]."""
+    value = expand_ranges(value)
     for env in expand_env_with_negation(value):
         result = [name_with_negate(f) for f in env.split("-")]
         yield result