Move to preview style, remove cruft, and add to changelog

Signed-off-by: cobalt <[email protected]>

CHANGES.md

@@ -24,6 +24,8 @@
   (#4498)
 - Remove parentheses around sole list items (#4312)
 - Collapse multiple empty lines after an import into one (#4489)
+- Prevent `string_processing` and `wrap_long_dict_values_in_parens` from removing
+  parenthesis around long dictionary values (#4377)
 
 ### Configuration
 
@@ -43,6 +45,7 @@
 ### Performance
 
 <!-- Changes that improve Black's performance. -->
+
 - Speed up the `is_fstring_start` function in Black's tokenizer (#4541)
 
 ### Output

src/black/linegen.py

@@ -988,7 +988,8 @@ def _maybe_split_omitting_optional_parens(
                 not can_be_split(rhs.body)
                 and not is_line_short_enough(rhs.body, mode=mode)
                 and not (
-                    rhs.opening_bracket.parent
+                    Preview.wrap_long_dict_values_in_parens
+                    and rhs.opening_bracket.parent
                     and rhs.opening_bracket.parent.parent
                     and rhs.opening_bracket.parent.parent.type == syms.dictsetmaker
                 )
@@ -1032,7 +1033,8 @@ def _prefer_split_rhs_oop_over_rhs(
 
     # Retain optional parens around dictionary values
     if (
-        rhs.opening_bracket.parent
+        Preview.wrap_long_dict_values_in_parens
+        and rhs.opening_bracket.parent
         and rhs.opening_bracket.parent.parent
         and rhs.opening_bracket.parent.parent.type == syms.dictsetmaker
         and rhs.body.bracket_tracker.delimiters
@@ -1639,22 +1641,19 @@ def maybe_make_parens_invisible_in_atom(
         or is_empty_tuple(node)
         or is_one_tuple(node)
         or (is_yield(node) and parent.type != syms.expr_stmt)
+        or (
+            # This condition tries to prevent removing non-optional brackets
+            # around a tuple, however, can be a bit overzealous so we provide
+            # and option to skip this check for `for` and `with` statements.
+            not remove_brackets_around_comma
+            and max_delimiter_priority_in_atom(node) >= COMMA_PRIORITY
+        )
         or is_tuple_containing_walrus(node)
         or is_tuple_containing_star(node)
         or is_generator(node)
     ):
         return False
 
-    max_delimiter_priority = max_delimiter_priority_in_atom(node)
-    # This condition tries to prevent removing non-optional brackets
-    # around a tuple, however, can be a bit overzealous so we provide
-    # and option to skip this check for `for` and `with` statements.
-    if not remove_brackets_around_comma and max_delimiter_priority >= COMMA_PRIORITY:
-        return False
-
-    # if parent.type == syms.dictsetmaker and max_delimiter_priority != 0:
-    #     return False
-
     if is_walrus_assignment(node):
         if parent.type in [
             syms.annassign,