Move const structures to their own object to prevent spillage

lib/widgets/comment.dart

@@ -13,18 +13,19 @@ import '../util/text_color.dart';
 import 'bottom_modal.dart';
 import 'markdown_text.dart';
 
-const colors = [
-  Colors.pink,
-  Colors.green,
-  Colors.amber,
-  Colors.cyan,
-  Colors.indigo,
-];
-
 class Comment extends StatelessWidget {
   final int indent;
   final int postCreatorId;
   final CommentTree commentTree;
+
+  static const colors = [
+    Colors.pink,
+    Colors.green,
+    Colors.amber,
+    Colors.cyan,
+    Colors.indigo,
+  ];
+
   Comment(
     this.commentTree, {
     this.indent = 0,

lib/widgets/comment_section.dart

@@ -7,14 +7,6 @@ import '../comment_tree.dart';
 import 'bottom_modal.dart';
 import 'comment.dart';
 
-const sortPairs = {
-  CommentSortType.hot: [Icons.whatshot, 'Hot'],
-  CommentSortType.new_: [Icons.new_releases, 'New'],
-  CommentSortType.old: [Icons.calendar_today, 'Old'],
-  CommentSortType.top: [Icons.trending_up, 'Top'],
-  CommentSortType.chat: [Icons.chat, 'Chat'],
-};
-
 /// Manages comments section, sorts them
 class CommentSection extends HookWidget {
   final List<CommentView> rawComments;
@@ -22,6 +14,14 @@ class CommentSection extends HookWidget {
   final int postCreatorId;
   final CommentSortType sortType;
 
+  static const sortPairs = {
+    CommentSortType.hot: [Icons.whatshot, 'Hot'],
+    CommentSortType.new_: [Icons.new_releases, 'New'],
+    CommentSortType.old: [Icons.calendar_today, 'Old'],
+    CommentSortType.top: [Icons.trending_up, 'Top'],
+    CommentSortType.chat: [Icons.chat, 'Chat'],
+  };
+
   CommentSection(
     List<CommentView> rawComments, {
     @required this.postCreatorId,