Fix fixture annotations for pytest

This means mostly these:

@fixture
def foo() -> Generator[int, None, None]: ...

jedi/plugins/pytest.py

@@ -31,7 +31,15 @@ def execute(callback):
 def infer_anonymous_param(func):
     def get_returns(value):
         if value.tree_node.annotation is not None:
-            return value.execute_with_values()
+            result = value.execute_with_values()
+            if any(v.name.get_qualified_names(include_module_names=True)
+                   == ('typing', 'Generator')
+                   for v in result):
+                return ValueSet.from_sets(
+                    v.py__getattribute__('__next__').execute_annotation()
+                    for v in result
+                )
+            return result
 
         # In pytest we need to differentiate between generators and normal
         # returns.

test/completion/pytest.py

@@ -1,3 +1,5 @@
+from typing import Generator
+
 import pytest
 from pytest import fixture
 
@@ -169,3 +171,15 @@ def test_inheritance_fixture(inheritance_fixture, caplog):
 @pytest.fixture
 def caplog(caplog):
     yield caplog
+
+# -----------------
+# Generator with annotation
+# -----------------
+
+@pytest.fixture
+def with_annot() -> Generator[float, None, None]:
+    pass
+
+def test_with_annot(inheritance_fixture, with_annot):
+    #? float()
+    with_annot