fixed selection dialog to close when selecting already selected value

lib/widgets/common/aves_radio_list_tile.dart

@@ -0,0 +1,97 @@
+import 'package:flutter/material.dart';
+
+// `RadioListTile` that can trigger `onChanged` on tap when already selected, if `reselectable` is true
+class AvesRadioListTile<T> extends StatelessWidget {
+  final T value;
+  final T groupValue;
+  final ValueChanged<T> onChanged;
+  final bool toggleable;
+  final bool reselectable;
+  final Color activeColor;
+  final Widget title;
+  final Widget subtitle;
+  final Widget secondary;
+  final bool isThreeLine;
+  final bool dense;
+  final bool selected;
+  final ListTileControlAffinity controlAffinity;
+  final bool autofocus;
+
+  bool get checked => value == groupValue;
+
+  const AvesRadioListTile({
+    Key key,
+    @required this.value,
+    @required this.groupValue,
+    @required this.onChanged,
+    this.toggleable = false,
+    this.reselectable = false,
+    this.activeColor,
+    this.title,
+    this.subtitle,
+    this.isThreeLine = false,
+    this.dense,
+    this.secondary,
+    this.selected = false,
+    this.controlAffinity = ListTileControlAffinity.platform,
+    this.autofocus = false,
+  })  : assert(toggleable != null),
+        assert(isThreeLine != null),
+        assert(!isThreeLine || subtitle != null),
+        assert(selected != null),
+        assert(controlAffinity != null),
+        assert(autofocus != null),
+        super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    final Widget control = Radio<T>(
+      value: value,
+      groupValue: groupValue,
+      onChanged: onChanged,
+      toggleable: toggleable,
+      activeColor: activeColor,
+      materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
+      autofocus: autofocus,
+    );
+    Widget leading, trailing;
+    switch (controlAffinity) {
+      case ListTileControlAffinity.leading:
+      case ListTileControlAffinity.platform:
+        leading = control;
+        trailing = secondary;
+        break;
+      case ListTileControlAffinity.trailing:
+        leading = secondary;
+        trailing = control;
+        break;
+    }
+    return MergeSemantics(
+      child: ListTileTheme.merge(
+        selectedColor: activeColor ?? Theme.of(context).accentColor,
+        child: ListTile(
+          leading: leading,
+          title: title,
+          subtitle: subtitle,
+          trailing: trailing,
+          isThreeLine: isThreeLine,
+          dense: dense,
+          enabled: onChanged != null,
+          onTap: onChanged != null
+              ? () {
+                  if (toggleable && checked) {
+                    onChanged(null);
+                    return;
+                  }
+                  if (reselectable || !checked) {
+                    onChanged(value);
+                  }
+                }
+              : null,
+          selected: selected,
+          autofocus: autofocus,
+        ),
+      ),
+    );
+  }
+}

lib/widgets/common/aves_selection_dialog.dart

@@ -1,3 +1,4 @@
+import 'package:aves/widgets/common/aves_radio_list_tile.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
 
@@ -46,7 +47,7 @@ class _AvesSelectionDialogState<T> extends State<AvesSelectionDialog> {
   }
 
   Widget _buildRadioListTile(T value, String title) {
-    return RadioListTile<T>(
+    return AvesRadioListTile<T>(
       key: Key(value.toString()),
       value: value,
       groupValue: _selectedValue,
@@ -55,6 +56,7 @@ class _AvesSelectionDialogState<T> extends State<AvesSelectionDialog> {
         Navigator.pop(context, _selectedValue);
         setState(() {});
       },
+      reselectable: true,
       title: Text(
         title,
         softWrap: false,

lib/widgets/welcome_page.dart

@@ -102,7 +102,7 @@ class _WelcomePageState extends State<WelcomePage> {
           text: 'Allow anonymous crash reporting',
         ),
         LabeledCheckbox(
-          key: Key('agree-termsCheckbox'),
+          key: Key('agree-checkbox'),
           value: _hasAcceptedTerms,
           onChanged: (v) => setState(() => _hasAcceptedTerms = v),
           text: 'I agree to the terms and conditions',