Ignore non-test section names and invalid factor filters (#2748)

Resolves https://github.com/tox-dev/tox/issues/2746

2 files changed, 4 insertions, 4 deletions

diff --git a/src/tox/config/loader/ini/factor.py b/src/tox/config/loader/ini/factor.py
index 731fe610..bc121a65 100644
--- a/src/tox/config/loader/ini/factor.py
+++ b/src/tox/config/loader/ini/factor.py
@@ -73,7 +73,7 @@ def expand_env_with_negation(value: str) -> Iterator[str]:
         if key:
             group_str = "".join(group).strip()
             elements = re.split(r"{([^}]+)}", group_str)
-            parts = [re.sub(r"\s+", "", elem).split(",") for elem in elements]
+            parts = [[i.strip() for i in elem.split(",")] for elem in elements]
             for variant in product(*parts):
                 variant_str = "".join(variant)
                 if not re.fullmatch(r"!?[\w._][\w._-]*", variant_str):
diff --git a/src/tox/config/source/ini.py b/src/tox/config/source/ini.py
index ee3ed77c..f3e0c083 100644
--- a/src/tox/config/source/ini.py
+++ b/src/tox/config/source/ini.py
@@ -83,9 +83,9 @@ class IniSource(Source):
 
         # discover all additional defined environments, including generative section headers
         for section in self.sections():
-            register_factors(section.names)
-            for name in section.names:
-                if section.is_test_env:
+            if section.is_test_env:
+                register_factors(section.names)
+                for name in section.names:
                     self._section_mapping[name].append(section.key)
                     yield name
         # add all conditional markers that are not part of the explicitly defined sections