Add reverse transition animation toggle (#683)

lib/pages/home.dart

@@ -94,7 +94,9 @@ class _HomePageState extends State<HomePage> {
             duration: Duration(
                 milliseconds:
                     settingsProvider.disablePageTransitions ? 0 : 300),
-            reverse: isReversing,
+            reverse: settingsProvider.reversePageTransitions
+                ? !isReversing
+                : isReversing,
             transitionBuilder: (
               Widget child,
               Animation<double> animation,

lib/pages/settings.dart

@@ -411,6 +411,21 @@ class _SettingsPageState extends State<SettingsPage> {
                                     })
                               ],
                             ),
+                            height16,
+                            Row(
+                              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                              children: [
+                                Flexible(
+                                    child: Text(tr('reversePageTransitions'))),
+                                Switch(
+                                    value:
+                                        settingsProvider.reversePageTransitions,
+                                    onChanged: (value) {
+                                      settingsProvider.reversePageTransitions =
+                                          value;
+                                    })
+                              ],
+                            ),
                             height32,
                             Text(
                               tr('categories'),

lib/providers/settings_provider.dart

@@ -300,4 +300,13 @@ class SettingsProvider with ChangeNotifier {
     prefs?.setBool('disablePageTransitions', show);
     notifyListeners();
   }
+
+  bool get reversePageTransitions {
+    return prefs?.getBool('reversePageTransitions') ?? false;
+  }
+
+  set reversePageTransitions(bool show) {
+    prefs?.setBool('reversePageTransitions', show);
+    notifyListeners();
+  }
 }