fmt [nfc]: Adjust newline placement to Flutter style

From the Flutter repo I've picked up a preference to avoid a
line break just after `=` or `=>`, and in a few similar "cliffhanger"
locations.  This is paired with a willingness to make some lines
longer than 80 columns when that helps readability:
  https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#prefer-a-maximum-line-length-of-80-characters
  https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using-for-short-functions-and-methods

We have some such "cliffhanger" newlines in our existing code,
much of it in places where the Dart autoformatter put it there
before I'd gotten a grasp on what I want to keep from the
autoformatter's output and what I don't.  So here's a quick sweep
through our code fixing those.

Conversely, fix a couple of too-long lines, and mismatched formatting
of parallel constructs, that I noticed while doing the sweep.

Author: gnprice

lib/api/model/events.dart

@@ -202,8 +202,7 @@ class MessageEvent extends Event {
     id: json['id'] as int,
     message: Message.fromJson({
       ...json['message'] as Map<String, dynamic>,
-      'flags':
-        (json['flags'] as List<dynamic>).map((e) => e as String).toList(),
+      'flags': (json['flags'] as List<dynamic>).map((e) => e as String).toList(),
     }),
   );
 

lib/api/model/model.dart

@@ -87,8 +87,9 @@ class User {
     return (value != null && value.isNotEmpty) ? value : null;
   }
 
-  static bool? _readIsSystemBot(Map json, String key) =>
-    json[key] ?? json['is_cross_realm_bot'];
+  static bool? _readIsSystemBot(Map json, String key) {
+    return json[key] ?? json['is_cross_realm_bot'];
+  }
 
   User({
     required this.userId,

lib/model/content.dart

@@ -226,8 +226,7 @@ final _emojiClassRegexp = RegExp(r"^emoji(-[0-9a-f]+)?$");
 
 InlineContentNode parseInlineContent(dom.Node node) {
   final debugHtmlNode = kDebugMode ? node : null;
-  InlineContentNode unimplemented() =>
-    UnimplementedInlineContentNode(htmlNode: node);
+  InlineContentNode unimplemented() => UnimplementedInlineContentNode(htmlNode: node);
 
   if (node is dom.Text) {
     return TextNode(node.text, debugHtmlNode: debugHtmlNode);
@@ -239,8 +238,9 @@ InlineContentNode parseInlineContent(dom.Node node) {
   final element = node;
   final localName = element.localName;
   final classes = element.classes;
-  List<InlineContentNode> nodes() =>
-    element.nodes.map(parseInlineContent).toList(growable: false);
+  List<InlineContentNode> nodes() {
+    return element.nodes.map(parseInlineContent).toList(growable: false);
+  }
 
   if (localName == 'br' && classes.isEmpty) {
     return LineBreakInlineNode(debugHtmlNode: debugHtmlNode);
@@ -410,8 +410,9 @@ BlockContentNode parseBlockContent(dom.Node node) {
   final localName = element.localName;
   final classes = element.classes;
   List<BlockContentNode> blockNodes() => parseBlockContentList(element.nodes);
-  List<InlineContentNode> inlineNodes() =>
-    element.nodes.map(parseInlineContent).toList(growable: false);
+  List<InlineContentNode> inlineNodes() {
+    return element.nodes.map(parseInlineContent).toList(growable: false);
+  }
 
   if (localName == 'br' && classes.isEmpty) {
     return LineBreakNode(debugHtmlNode: debugHtmlNode);
@@ -489,8 +490,7 @@ List<BlockContentNode> parseImplicitParagraphBlockContentList(dom.NodeList nodes
   void consumeParagraph() {
     result.add(ParagraphNode(
       wasImplicit: true,
-      nodes:
-        currentParagraph.map(parseInlineContent).toList(growable: false)));
+      nodes: currentParagraph.map(parseInlineContent).toList(growable: false)));
     currentParagraph.clear();
   }
 

lib/model/message_list.dart

@@ -57,8 +57,10 @@ class MessageListView extends ChangeNotifier {
     assert(messages.isEmpty);
     assert(contents.isEmpty);
     // TODO schedule all this in another isolate
-    final result =
-      await getMessages(store.connection, numBefore: 100, numAfter: 10);
+    final result = await getMessages(store.connection,
+      numBefore: 100,
+      numAfter: 10,
+    );
     messages.addAll(result.messages);
     contents.addAll(_contentsOfMessages(result.messages));
     _fetched = true;
@@ -92,8 +94,7 @@ class MessageListView extends ChangeNotifier {
     notifyListeners();
   }
 
-  static Iterable<ZulipContent> _contentsOfMessages(
-      Iterable<Message> messages) {
+  static Iterable<ZulipContent> _contentsOfMessages(Iterable<Message> messages) {
     // This will get more complicated to handle the ways that messages interact
     // with the display of neighboring messages: sender headings,
     // recipient headings, and date separators.

lib/model/store.dart

@@ -149,7 +149,8 @@ class PerAccountStore extends ChangeNotifier {
     required this.connection,
     required InitialSnapshot initialSnapshot,
   }) : zulipVersion = initialSnapshot.zulipVersion,
-       users = Map.fromEntries(initialSnapshot.realmUsers
+       users = Map.fromEntries(
+         initialSnapshot.realmUsers
          .followedBy(initialSnapshot.realmNonActiveUsers)
          .followedBy(initialSnapshot.crossRealmBots)
          .map((user) => MapEntry(user.userId, user))),

lib/widgets/compose_box.dart

@@ -250,7 +250,9 @@ Future<void> _uploadFiles({
       context: context,
       title: 'File(s) too large',
       message:
-        '${tooLargeFiles.length} file(s) are larger than the server\'s limit of ${store.maxFileUploadSizeMib} MiB and will not be uploaded:\n\n$listMessage');
+        '${tooLargeFiles.length} file(s) are larger than the server\'s limit'
+        ' of ${store.maxFileUploadSizeMib} MiB and will not be uploaded:'
+        '\n\n$listMessage');
   }
 
   final List<(int, _File)> uploadsInProgress = [];
@@ -320,7 +322,10 @@ abstract class _AttachUploadsButton extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return IconButton(icon: Icon(icon), tooltip: tooltip, onPressed: () => _handlePress(context));
+    return IconButton(
+      icon: Icon(icon),
+      tooltip: tooltip,
+      onPressed: () => _handlePress(context));
   }
 }
 

lib/widgets/content.dart

@@ -97,8 +97,7 @@ class BlockContentNodeWidget extends StatelessWidget {
             border: Border(
               left: BorderSide(
                 width: 5,
-                color: const HSLColor.fromAHSL(1, 0, 0, 0.87)
-                  .toColor()))),
+                color: const HSLColor.fromAHSL(1, 0, 0, 0.87).toColor()))),
           child: BlockContentList(nodes: node.nodes)));
     } else if (node is CodeBlockNode) {
       return CodeBlock(node: node);
@@ -311,15 +310,13 @@ InlineSpan _buildInlineNode(InlineContentNode node) {
     return styled(node.nodes,
       TextStyle(color: const HSLColor.fromAHSL(1, 200, 1, 0.4).toColor()));
   } else if (node is UserMentionNode) {
-    return WidgetSpan(
-      alignment: PlaceholderAlignment.middle, child: UserMention(node: node));
+    return WidgetSpan(alignment: PlaceholderAlignment.middle,
+      child: UserMention(node: node));
   } else if (node is UnicodeEmojiNode) {
-    return WidgetSpan(
-      alignment: PlaceholderAlignment.middle,
+    return WidgetSpan(alignment: PlaceholderAlignment.middle,
       child: MessageUnicodeEmoji(node: node));
   } else if (node is ImageEmojiNode) {
-    return WidgetSpan(
-      alignment: PlaceholderAlignment.middle,
+    return WidgetSpan(alignment: PlaceholderAlignment.middle,
       child: MessageImageEmoji(node: node));
   } else if (node is UnimplementedInlineContentNode) {
     return _errorUnimplemented(node);

lib/widgets/dialog.dart

@@ -15,7 +15,11 @@ Widget _dialogActionText(String text) {
 }
 
 // TODO(i18n): title, message, and action-button text
-void showErrorDialog({required BuildContext context, required String title, String? message}) {
+void showErrorDialog({
+  required BuildContext context,
+  required String title,
+  String? message,
+}) {
   showDialog(
     context: context,
     builder: (BuildContext context) => AlertDialog(
@@ -35,7 +39,9 @@ void showSuggestedActionDialog({
   required String? actionButtonText,
   required VoidCallback onActionButtonPress,
 }) {
-  showDialog(context: context, builder: (BuildContext context) => AlertDialog(
+  showDialog(
+    context: context,
+    builder: (BuildContext context) => AlertDialog(
       title: Text(title),
       content: SingleChildScrollView(child: Text(message)),
       actions: [

lib/widgets/message_list.dart

@@ -13,7 +13,7 @@ import 'sticky_header.dart';
 import 'store.dart';
 
 class MessageList extends StatefulWidget {
-  const MessageList({Key? key}) : super(key: key);
+  const MessageList({super.key});
 
   @override
   State<StatefulWidget> createState() => _MessageListState();
@@ -212,8 +212,7 @@ class StreamTopicRecipientHeader extends StatelessWidget {
         RecipientHeaderChevronContainer(
           color: streamColor,
           // TODO globe/lock icons for web-public and private streams
-          child:
-            Text(streamName, style: TextStyle(color: contrastingColor))),
+          child: Text(streamName, style: TextStyle(color: contrastingColor))),
         Expanded(
           child: Padding(
             // Web has padding 9, 3, 3, 2 here; but 5px is the chevron.
@@ -229,8 +228,7 @@ class StreamTopicRecipientHeader extends StatelessWidget {
   }
 }
 
-final _kStreamMessageBorderColor =
-  const HSLColor.fromAHSL(1, 0, 0, 0.88).toColor();
+final _kStreamMessageBorderColor = const HSLColor.fromAHSL(1, 0, 0, 0.88).toColor();
 
 class PmRecipientHeader extends StatelessWidget {
   const PmRecipientHeader({super.key, required this.message});

lib/widgets/sticky_header.dart

@@ -194,14 +194,14 @@ class RenderSliverStickyHeaderList extends RenderSliverList {
 
       double childScrollOffset;
       if (innerChild.direction == constraints.axisDirection) {
-        childScrollOffset =
-          math.max(0.0, scrollOffset - parentData.layoutOffset!);
+        childScrollOffset = math.max(0.0,
+          scrollOffset - parentData.layoutOffset!);
       } else {
         final childEndOffset =
           parentData.layoutOffset! + child.size.onAxis(constraints.axis);
         // TODO should this be our layoutExtent or paintExtent, or what?
-        childScrollOffset = math.max(
-          0.0, childEndOffset - (scrollOffset + geometry!.layoutExtent));
+        childScrollOffset = math.max(0.0,
+          childEndOffset - (scrollOffset + geometry!.layoutExtent));
       }
       innerChild.provideScrollPosition(childScrollOffset);
     }
@@ -211,11 +211,12 @@ class RenderSliverStickyHeaderList extends RenderSliverList {
 enum StickyHeaderSlot { header, content }
 
 class StickyHeader extends SlottedMultiChildRenderObjectWidget<StickyHeaderSlot, RenderBox> {
-  const StickyHeader(
-    {super.key,
+  const StickyHeader({
+    super.key,
     this.direction = AxisDirection.down,
     this.header,
-    this.content});
+    this.content,
+  });
 
   final AxisDirection direction;
   final Widget? header;
@@ -241,8 +242,7 @@ class StickyHeader extends SlottedMultiChildRenderObjectWidget<StickyHeaderSlot,
   }
 }
 
-class RenderStickyHeader extends RenderBox
-    with SlottedContainerRenderObjectMixin<StickyHeaderSlot, RenderBox> {
+class RenderStickyHeader extends RenderBox with SlottedContainerRenderObjectMixin<StickyHeaderSlot, RenderBox> {
   RenderStickyHeader({required AxisDirection direction})
     : _direction = direction;
 
@@ -260,8 +260,10 @@ class RenderStickyHeader extends RenderBox
   }
 
   @override
-  Iterable<RenderBox> get children =>
-    [if (_header != null) _header!, if (_content != null) _content!];
+  Iterable<RenderBox> get children => [
+    if (_header != null) _header!,
+    if (_content != null) _content!,
+  ];
 
   double? _slackSize;
 
@@ -351,8 +353,7 @@ class RenderStickyHeader extends RenderBox
     return false;
   }
 
-  BoxParentData _parentData(RenderBox child) =>
-    child.parentData! as BoxParentData;
+  BoxParentData _parentData(RenderBox child) => child.parentData! as BoxParentData;
 }
 
 Size sizeOn(Axis axis, {double main = 0, double cross = 0}) {