Only allow non-fractional decimals
MODIFY
WalletWasabi.Gui/Controls/WalletExplorer/SendControlViewModel.cs
WalletWasabi.Gui/Controls/WalletExplorer/SendControlViewModel.cs
@@ -816,6 +816,7 @@ namespace WalletWasabi.Gui.Controls.WalletExplorer
userFeeText is { }
&& !userFeeText.Contains(",")
&& decimal.TryParse(userFeeText, out userFee)
+ && Math.Ceiling(userFee) == Math.Floor(userFee)
&& Math.Round(userFee) < MaxSatoshisSupplyLimit
&& Math.Round(userFee) > 0;
}

Only allow non-fractional decimals