Fix not all args are passed to handler function invocation (#633)

aiogram/dispatcher/event/handler.py

@@ -32,7 +32,9 @@ def _prepare_kwargs(self, kwargs: Dict[str, Any]) -> Dict[str, Any]:
         if self.spec.varkw:
             return kwargs
 
-        return {k: v for k, v in kwargs.items() if k in self.spec.args}
+        return {
+            k: v for k, v in kwargs.items() if k in self.spec.args or k in self.spec.kwonlyargs
+        }
 
     async def call(self, *args: Any, **kwargs: Any) -> Any:
         wrapped = partial(self.callback, *args, **self._prepare_kwargs(kwargs))

tests/test_dispatcher/test_event/test_handler.py

@@ -22,6 +22,10 @@ async def callback3(foo: int, **kwargs):
     return locals()
 
 
+async def callback4(foo: int, *, bar: int, baz: int):
+    return locals()
+
+
 class Filter(BaseFilter):
     async def __call__(self, foo: int, bar: int, baz: int) -> Union[bool, Dict[str, Any]]:
         return locals()
@@ -95,11 +99,21 @@ def callback2(foo, bar, baz):
                 {"foo": 42, "spam": True, "baz": "fuz", "bar": "test"},
                 {"foo": 42, "baz": "fuz", "bar": "test"},
             ),
+            pytest.param(
+                functools.partial(callback2, bar="test"),
+                {"foo": 42, "spam": True, "baz": "fuz"},
+                {"foo": 42, "baz": "fuz"},
+            ),
             pytest.param(
                 callback3,
                 {"foo": 42, "spam": True, "baz": "fuz", "bar": "test"},
                 {"foo": 42, "spam": True, "baz": "fuz", "bar": "test"},
             ),
+            pytest.param(
+                callback4,
+                {"foo": 42, "spam": True, "baz": "fuz", "bar": "test"},
+                {"foo": 42, "baz": "fuz", "bar": "test"},
+            ),
             pytest.param(
                 Filter(), {"foo": 42, "spam": True, "baz": "fuz"}, {"foo": 42, "baz": "fuz"}
             ),