Make from_obj() work for List/Dict configtypes

We can't easily make it work for ListOrValue as we don't know which of both we
get at this point.

qutebrowser/config/configtypes.py

@@ -451,7 +451,7 @@ class List(BaseType):
     def from_obj(self, value):
         if value is None:
             return []
-        return value
+        return [self.valtype.from_obj(v) for v in value]
 
     def to_py(self, value):
         self._basic_py_validation(value, list)
@@ -1199,7 +1199,9 @@ class Dict(BaseType):
     def from_obj(self, value):
         if value is None:
             return {}
-        return value
+
+        return {self.keytype.from_obj(key): self.valtype.from_obj(val)
+                for key, val in value.items()}
 
     def _fill_fixed_keys(self, value):
         """Fill missing fixed keys with a None-value."""

tests/unit/config/test_configtypes.py

@@ -533,6 +533,14 @@ class FlagListSubclass(configtypes.FlagList):
                 'foo', 'bar', 'baz')
 
 
+class FromObjType(configtypes.BaseType):
+
+    """Config type to test from_obj for List/Dict."""
+
+    def from_obj(self, obj):
+        return int(obj)
+
+
 class TestList:
 
     """Test List and FlagList."""
@@ -647,6 +655,12 @@ class TestList:
         with pytest.raises(AssertionError):
             typ.to_doc([['foo']])
 
+    def test_from_obj_sub(self):
+        """Make sure the list calls from_obj() on sub-types."""
+        typ = configtypes.List(valtype=FromObjType())
+        value = typ.from_obj(['1', '2'])
+        assert value == [1, 2]
+
 
 class TestFlagList:
 
@@ -1665,6 +1679,13 @@ class TestDict:
         print(doc)
         assert doc == expected
 
+    def test_from_obj_sub(self):
+        """Make sure the dict calls from_obj() on sub-types."""
+        typ = configtypes.Dict(keytype=configtypes.String(),
+                               valtype=FromObjType())
+        value = typ.from_obj({'1': '2'})
+        assert value == {'1': 2}
+
 
 def unrequired_class(**kwargs):
     return configtypes.File(required=False, **kwargs)