Fix extracting extras from markers with many extras (#2792)

Co-authored-by: Bernát Gábor <gaborjbernat@gmail.com>

docs/changelog/2791.bugfix.rst

@@ -0,0 +1 @@
+Fix extracting extras from markers with many extras - by :user:`q0w`.

src/tox/tox_env/python/virtual_env/package/util.py

@@ -45,10 +45,9 @@ def extract_extra_markers(deps: list[Requirement]) -> list[tuple[Requirement, se
                 extra_markers.add(marker_value.value)
                 del markers[_at]
                 _at -= 1
-                if _at > 0 and (isinstance(markers[_at], str) and markers[_at] in ("and", "or")):
+                if _at >= 0 and (isinstance(markers[_at], str) and markers[_at] in ("and", "or")):
                     del markers[_at]
                 if len(markers) == 0:
                     req.marker = None
-                break
         result.append((req, extra_markers or {None}))
     return result

tests/tox_env/python/virtual_env/package/test_python_package_util.py

@@ -63,3 +63,9 @@ def test_loads_deps_recursive_extras() -> None:
     ]
     result = dependencies_with_extras(requires, {"dev"}, "name")
     assert [str(i) for i in result] == ["no-extra", "dep1[magic]", "dep1", "dep2[a,b]"]
+
+
+def test_load_dependency_requirement_or_extras() -> None:
+    requires = [Requirement('filelock<4.0.0,>=3.9.0; extra == "extras1" or extra == "extras2"')]
+    result = dependencies_with_extras(requires, {"extras1"}, "")
+    assert [str(r) for r in result] == ["filelock<4.0.0,>=3.9.0"]