message: Create partition for AssignmentPattern expressions
diff: @@ -964,8 +964,8 @@ void TreeUnwrapper::SetIndentationsAndCreatePartitions(
  // This allows for indenting initializer lists
  if (Context().DirectParentIs(NodeEnum::kAssignmentPattern)) {
  // Do not further indent preprocessor clauses.
  - const int indent = suppress_indentation ? 0 : style_.wrap_spaces;
  - VisitIndentedSection(node, indent, PartitionPolicyEnum::kAlwaysExpand);
  + const int indent = suppress_indentation ? 0 : style_.indentation_spaces;
  + VisitIndentedSection(node, indent, PartitionPolicyEnum::kFitOnLineElseExpand);
  } else {
  // Default handling
  TraverseChildren(node);
  @@ -1146,6 +1146,9 @@ void TreeUnwrapper::SetIndentationsAndCreatePartitions(
  Context().IsInside(NodeEnum::kConcatenationExpression)) {
  VisitIndentedSection(node, 0,
  PartitionPolicyEnum::kFitOnLineElseExpand);
  + } else if (Context().DirectParentIs(NodeEnum::kAssignmentPattern)) {
  + VisitIndentedSection(node, style_.wrap_spaces,
  + PartitionPolicyEnum::kFitOnLineElseExpand);
  } else {
  TraverseChildren(node);
  }
  