Fix unnecessary nesting when wrapping long dict (#4135)

Fixes #4129

CHANGES.md

@@ -23,6 +23,7 @@
   blocks, except immediately before a docstring (#4130)
 - For stubs, fix logic to enforce empty line after nested classes with bodies (#4141)
 - Fix crash when using a walrus in a dictionary (#4155)
+- Fix unnecessary parentheses when wrapping long dicts (#4135)
 
 ### Configuration
 

src/black/linegen.py

@@ -244,15 +244,14 @@ def visit_dictsetmaker(self, node: Node) -> Iterator[Line]:
                 if node.children[i - 1].type == token.COLON:
                     if (
                         child.type == syms.atom
-                        and child.children[0].type == token.LPAR
+                        and child.children[0].type in OPENING_BRACKETS
                         and not is_walrus_assignment(child)
                     ):
-                        if maybe_make_parens_invisible_in_atom(
+                        maybe_make_parens_invisible_in_atom(
                             child,
                             parent=node,
                             remove_brackets_around_comma=False,
-                        ):
-                            wrap_in_parentheses(node, child, visible=False)
+                        )
                     else:
                         wrap_in_parentheses(node, child, visible=False)
         yield from self.visit_default(node)

tests/data/cases/preview_long_dict_values.py

@@ -37,6 +37,26 @@
 }
 
 
+class Random:
+    def func():
+        random_service.status.active_states.inactive = (
+            make_new_top_level_state_from_dict(
+                {
+                    "topLevelBase": {
+                        "secondaryBase": {
+                            "timestamp": 1234,
+                            "latitude": 1,
+                            "longitude": 2,
+                            "actionTimestamp": Timestamp(
+                                seconds=1530584000, nanos=0
+                            ).ToJsonString(),
+                        }
+                    },
+                }
+            )
+        )
+
+
 # output
 
 
@@ -89,3 +109,21 @@
         }
     ),
 }
+
+
+class Random:
+    def func():
+        random_service.status.active_states.inactive = (
+            make_new_top_level_state_from_dict({
+                "topLevelBase": {
+                    "secondaryBase": {
+                        "timestamp": 1234,
+                        "latitude": 1,
+                        "longitude": 2,
+                        "actionTimestamp": (
+                            Timestamp(seconds=1530584000, nanos=0).ToJsonString()
+                        ),
+                    }
+                },
+            })
+        )