Generic fixes (#1304)

* fix mobx no element error

* fix mobx issue

* Remove unused code

* Enhance error handling for monero sync failure case

* Separate litecoin mnemonic exception from bitcoin

* - Enable onramper for polygon
- Add Kaspa validation

* Set null as the default length of address validation

* Modify EVM fee text [skip ci]

* Add seed length option to polygon

* Add digibyte

* Update configure_cake_wallet.sh and fix conflicts

* Pin bottom section

* Fix Solana missing isTestnet param

lib/view_model/advanced_privacy_settings_view_model.dart

@@ -27,11 +27,25 @@ abstract class AdvancedPrivacySettingsViewModelBase with Store {
 
   final SettingsStore _settingsStore;
 
-  bool get hasSeedPhraseLengthOption =>
-      type == WalletType.bitcoinCash ||
-      type == WalletType.ethereum ||
-      type == WalletType.polygon ||
-      type == WalletType.solana;
+  bool get hasSeedPhraseLengthOption {
+    // convert to switch case so that it give a syntax error when adding a new wallet type
+    // thus we don't forget about it
+    switch (type) {
+      case WalletType.ethereum:
+      case WalletType.bitcoinCash:
+      case WalletType.polygon:
+      case WalletType.solana:
+        return true;
+      case WalletType.monero:
+      case WalletType.none:
+      case WalletType.bitcoin:
+      case WalletType.litecoin:
+      case WalletType.haven:
+      case WalletType.nano:
+      case WalletType.banano:
+        return false;
+    }
+  }
 
   bool get hasSeedTypeOption => type == WalletType.monero;
 

lib/view_model/unspent_coins/unspent_coins_list_view_model.dart

@@ -15,7 +15,8 @@ class UnspentCoinsListViewModel = UnspentCoinsListViewModelBase with _$UnspentCo
 abstract class UnspentCoinsListViewModelBase with Store {
   UnspentCoinsListViewModelBase(
       {required this.wallet, required Box<UnspentCoinsInfo> unspentCoinsInfo})
-      : _unspentCoinsInfo = unspentCoinsInfo {
+      : _unspentCoinsInfo = unspentCoinsInfo,
+        _items = ObservableList<UnspentCoinsItem>() {
     _updateUnspentCoinsInfo();
     _updateUnspents();
   }
@@ -23,7 +24,8 @@ abstract class UnspentCoinsListViewModelBase with Store {
   WalletBase wallet;
   final Box<UnspentCoinsInfo> _unspentCoinsInfo;
 
-  final ObservableList<UnspentCoinsItem> _items = ObservableList();
+  @observable
+  ObservableList<UnspentCoinsItem> _items;
 
   @computed
   ObservableList<UnspentCoinsItem> get items => _items;

lib/view_model/wallet_keys_view_model.dart

@@ -20,9 +20,7 @@ abstract class WalletKeysViewModelBase with Store {
   WalletKeysViewModelBase(this._appStore)
       : title = _appStore.wallet!.type == WalletType.bitcoin ||
                 _appStore.wallet!.type == WalletType.litecoin ||
-                _appStore.wallet!.type == WalletType.bitcoinCash ||
-                _appStore.wallet!.type == WalletType.ethereum ||
-                _appStore.wallet!.type == WalletType.polygon
+                _appStore.wallet!.type == WalletType.bitcoinCash
             ? S.current.wallet_seed
             : S.current.wallet_keys,
         _restoreHeight = _appStore.wallet!.walletInfo.restoreHeight,