refactor: use spread operator

lib/screens/login.dart

@@ -101,16 +101,16 @@ class _LoginScreenState extends State<LoginScreen> {
 
         return Container(
           child: Column(
-            children: settings.githubAccountMap.entries
+            children: [
+              ...settings.githubAccountMap.entries
                   .map<Widget>((entry) => _buildAccountItem(AccountModel(
                       avatarUrl: entry.value.avatarUrl,
                       token: entry.value.token,
                       platform: PlatformType.github,
                       domain: 'https://github.com',
                       login: entry.key)))
-                .toList()
-                  ..addAll(accounts.map(_buildAccountItem))
-                  ..addAll([
+                  .toList(),
+              ...accounts.map(_buildAccountItem),
               _buildAddItem(
                 text: 'GitHub Account',
                 onTap: () {
@@ -124,7 +124,7 @@ class _LoginScreenState extends State<LoginScreen> {
               //   text: 'GitLab Account',
               //   screenBuilder: (_) => LoginGitlabScreen(),
               // )
-                  ]),
+            ],
           ),
         );
       },

lib/screens/notifications.dart

@@ -274,11 +274,12 @@ $key: pullRequest(number: ${item.number}) {
       bodyBuilder: () {
         return groupMap.isEmpty
             ? EmptyWidget()
-            : Column(
-                children: [Padding(padding: EdgeInsets.only(top: 10))]..addAll(
-                    groupMap.entries
+            : Column(children: [
+                Padding(padding: EdgeInsets.only(top: 10)),
+                ...groupMap.entries
                     .map((entry) => _buildGroupItem(context, entry))
-                        .toList()));
+                    .toList()
+              ]);
       },
     );
   }

lib/screens/organization.dart

@@ -134,9 +134,7 @@ class _OrganizationScreenState extends State<OrganizationScreen> {
       onRefresh: query,
       title: Text(widget.login),
       trailingBuilder: (payload) {
-        List<Action> actions = [];
-
-        actions.addAll([
+        return ActionButton(title: 'User Actions', actions: [
           Action(
             text: 'Share',
             onPress: () {
@@ -150,8 +148,6 @@ class _OrganizationScreenState extends State<OrganizationScreen> {
             },
           ),
         ]);
-
-        return ActionButton(title: 'User Actions', actions: actions);
       },
       bodyBuilder: (payload) {
         return Column(

lib/widgets/event_item.dart

@@ -56,12 +56,6 @@ class EventItem extends StatelessWidget {
     IconData iconData = Octicons.octoface,
     WidgetBuilder screenBuilder,
   }) {
-    var _spans = [
-      createLinkSpan(
-          context, event.actorLogin, () => UserScreen(event.actorLogin))
-    ];
-    _spans.addAll(spans);
-
     return Container(
       padding: EdgeInsets.all(8),
       child: Column(
@@ -76,7 +70,14 @@ class EventItem extends StatelessWidget {
                   text: TextSpan(
                     style: TextStyle(
                         color: Colors.black, height: 1.3, fontSize: 15),
-                    children: _spans,
+                    children: [
+                      createLinkSpan(
+                        context,
+                        event.actorLogin,
+                        () => UserScreen(event.actorLogin),
+                      ),
+                      ...spans,
+                    ],
                   ),
                 ),
               ),

lib/widgets/table_view.dart

@@ -46,7 +46,7 @@ class TableView extends StatelessWidget {
             ),
             padding: EdgeInsets.only(top: 4),
           ),
-        ]..addAll(items.map((item) {
+          ...items.map((item) {
             List<Widget> children = [
               Expanded(
                 child: Text(
@@ -71,7 +71,8 @@ class TableView extends StatelessWidget {
                 child: Row(children: children),
               ),
             );
-          }).toList()),
+          }).toList()
+        ],
       ),
     );
   }

pubspec.yaml

@@ -10,7 +10,7 @@ description: A new Flutter project.
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: ">=2.3.0-dev <3.0.0"
 
 dependencies:
   flutter: