dynamic max fee rate value (#1395)

lib/view_model/send/send_view_model.dart

@@ -166,6 +166,13 @@ abstract class SendViewModelBase extends WalletChangeListenerViewModel with Stor
     return null;
   }
 
+  int? get maxCustomFeeRate {
+    if (wallet.type == WalletType.bitcoin) {
+      return bitcoin!.getMaxCustomFeeRate(wallet);
+    }
+    return null;
+  }
+
   @computed
   int get customBitcoinFeeRate => _settingsStore.customBitcoinFeeRate;
 

lib/view_model/settings/other_settings_view_model.dart

@@ -140,6 +140,13 @@ abstract class OtherSettingsViewModelBase with Store {
     return customItem != null ? priorities.indexOf(customItem) : null;
   }
 
+  int? get maxCustomFeeRate {
+    if (_wallet.type == WalletType.bitcoin) {
+      return bitcoin!.getMaxCustomFeeRate(_wallet);
+    }
+    return null;
+  }
+
   @action
   ProviderType onBuyProviderTypeSelected(ProviderType buyProviderType) =>
       _settingsStore.defaultBuyProviders[walletType] = buyProviderType;

lib/view_model/transaction_details_view_model.dart

@@ -348,12 +348,14 @@ abstract class TransactionDetailsViewModelBase with Store {
     final customItem = priorities.firstWhereOrNull(
         (element) => element == sendViewModel.bitcoinTransactionPriorityCustom);
     final customItemIndex = customItem != null ? priorities.indexOf(customItem) : null;
+    final maxCustomFeeRate = sendViewModel.maxCustomFeeRate?.toDouble();
 
     RBFListItems.add(StandardPickerListItem(
         title: S.current.estimated_new_fee,
         value: bitcoin!.formatterBitcoinAmountToString(amount: newFee) + ' ${walletTypeToCryptoCurrency(wallet.type)}',
         items: priorityForWalletType(wallet.type),
         customValue: settingsStore.customBitcoinFeeRate.toDouble(),
+        maxValue: maxCustomFeeRate,
         selectedIdx: selectedItem,
         customItemIndex: customItemIndex ?? 0,
         displayItem: (dynamic priority, double sliderValue) =>