ignore amount digits beyond the selected unit precision in the send tab amount and fee fields and the send to many grid, instead of truncating them in the payment

### src/main/java/com/sparrowwallet/sparrow/control/CoinAxisFormatter.java
@@ -24,13 +24,13 @@ public String toString(Number object) {
         }
 
         Double value = bitcoinUnit.getValue(object.longValue());
-        return new CoinTextFormatter(unitFormat).getCoinFormat().format(value);
+        return new CoinTextFormatter(unitFormat, bitcoinUnit).getCoinFormat().format(value);
     }
 
     @Override
     public Number fromString(String string) {
         try {
-            Number number = new CoinTextFormatter(unitFormat).getCoinFormat().parse(string);
+            Number number = new CoinTextFormatter(unitFormat, bitcoinUnit).getCoinFormat().parse(string);
             return bitcoinUnit.getSatsValue(number.doubleValue());
         } catch (ParseException e) {
             throw new RuntimeException(e);

### src/main/java/com/sparrowwallet/sparrow/control/CoinTextFormatter.java
@@ -1,5 +1,6 @@
 package com.sparrowwallet.sparrow.control;
 
+import com.sparrowwallet.drongo.BitcoinUnit;
 import com.sparrowwallet.sparrow.UnitFormat;
 import javafx.scene.control.TextFormatter;
 import javafx.scene.control.TextInputControl;
@@ -11,8 +12,8 @@
 import java.util.regex.Pattern;
 
 public class CoinTextFormatter extends TextFormatter<String> {
-    public CoinTextFormatter(UnitFormat unitFormat) {
-        super(new CoinFilter(unitFormat == null ? UnitFormat.DOT : unitFormat));
+    public CoinTextFormatter(UnitFormat unitFormat, BitcoinUnit bitcoinUnit) {
+        super(new CoinFilter(unitFormat == null ? UnitFormat.DOT : unitFormat, bitcoinUnit));
     }
 
     public UnitFormat getUnitFormat() {
@@ -27,11 +28,16 @@ private static class CoinFilter implements UnaryOperator<Change> {
         private final UnitFormat unitFormat;
         private final DecimalFormat coinFormat;
         private final Pattern coinValidation;
+        private final Pattern anyPrecisionAmount;
 
-        public CoinFilter(UnitFormat unitFormat) {
+        public CoinFilter(UnitFormat unitFormat, BitcoinUnit bitcoinUnit) {
             this.unitFormat = unitFormat;
             this.coinFormat = new DecimalFormat("###,###.########", unitFormat.getDecimalFormatSymbols());
-            this.coinValidation = Pattern.compile("[\\d" + Pattern.quote(unitFormat.getGroupingSeparator()) + "]*(" + Pattern.quote(unitFormat.getDecimalSeparator()) + "\\d{0,8})?");
+            String integer = "[\\d" + Pattern.quote(unitFormat.getGroupingSeparator()) + "]*";
+            //A satoshi is indivisible, so a sats amount has no fractional part to validate
+            String fraction = bitcoinUnit == BitcoinUnit.SATOSHIS ? "" : "(" + Pattern.quote(unitFormat.getDecimalSeparator()) + "\\d{0,8})?";
+            this.coinValidation = Pattern.compile(integer + fraction);
+            this.anyPrecisionAmount = Pattern.compile(integer + "(" + Pattern.quote(unitFormat.getDecimalSeparator()) + "\\d*)?");
         }
 
         @Override
@@ -51,12 +57,13 @@ public Change apply(Change change) {
                 commasRemoved = newText.length() - noFractionCommaText.length();
             }
 
-            Matcher matcher = coinValidation.matcher(noFractionCommaText);
-            boolean validAmount = matcher.matches();
+            boolean validAmount = coinValidation.matcher(noFractionCommaText).matches();
             if(!validAmount) {
-                matcher.reset();
-                if(matcher.find()) {
-                    noFractionCommaText = matcher.group();
+                //The amount a pasted text starts with is taken, unless it is more precise than the unit allows - that is ignored rather than truncated,
+                //so a digit typed beyond the last place leaves the field as it was
+                Matcher leadingAmount = anyPrecisionAmount.matcher(noFractionCommaText);
+                if(leadingAmount.find() && coinValidation.matcher(leadingAmount.group()).matches()) {
+                    noFractionCommaText = leadingAmount.group();
                 } else {
                     return null;
                 }
@@ -78,12 +85,13 @@ public Change apply(Change change) {
                 Number value = coinFormat.parse(noFractionCommaText);
                 String correct = coinFormat.format(value.doubleValue());
 
+                //Trailing fractional zeros and a trailing separator are left as typed so the fraction can still be entered, but only where the entire text is a valid amount
                 String compare = newText;
-                if(compare.contains(unitFormat.getDecimalSeparator()) && compare.endsWith("0")) {
+                if(validAmount && compare.contains(unitFormat.getDecimalSeparator()) && compare.endsWith("0")) {
                     compare = compare.replaceAll("0*$", "");
                 }
 
-                if(compare.endsWith(unitFormat.getDecimalSeparator())) {
+                if(validAmount && compare.endsWith(unitFormat.getDecimalSeparator())) {
                     compare = compare.substring(0, compare.length() - 1);
                 }
 

### src/main/java/com/sparrowwallet/sparrow/control/SendToManyDialog.java
@@ -59,7 +59,7 @@ public SendToManyDialog(Wallet wallet, BitcoinUnit bitcoinUnit, UnitFormat unitF
         this.wallet = wallet;
         this.bitcoinUnit = bitcoinUnit;
         this.unitFormat = unitFormat == null ? UnitFormat.DOT : unitFormat;
-        this.amountCellType = new UnitFormatDoubleCellType(this.unitFormat);
+        this.amountCellType = new UnitFormatDoubleCellType(this.unitFormat, bitcoinUnit);
 
         final DialogPane dialogPane = new SendToManyDialogPane();
         setDialogPane(dialogPane);
@@ -373,10 +373,12 @@ public String toString(SendToAddress item, String format) {
 
     private static class UnitFormatDoubleCellType extends SpreadsheetCellType<Double> {
         private final UnitFormat unitFormat;
+        private final BitcoinUnit bitcoinUnit;
 
-        UnitFormatDoubleCellType(UnitFormat unitFormat) {
-            super(new UnitFormatDoubleConverter(unitFormat));
+        UnitFormatDoubleCellType(UnitFormat unitFormat, BitcoinUnit bitcoinUnit) {
+            super(new UnitFormatDoubleConverter(unitFormat, bitcoinUnit));
             this.unitFormat = unitFormat;
+            this.bitcoinUnit = bitcoinUnit;
         }
 
         @Override
@@ -392,7 +394,7 @@ public SpreadsheetCell createCell(int row, int column, int rowSpan, int columnSp
 
         @Override
         public SpreadsheetCellEditor createEditor(SpreadsheetView view) {
-            return new UnitFormatDoubleEditor(view, unitFormat);
+            return new UnitFormatDoubleEditor(view, unitFormat, bitcoinUnit);
         }
 
         @Override
@@ -432,21 +434,26 @@ public String toString(Double item, String format) {
 
     private static class UnitFormatDoubleConverter extends StringConverterWithFormat<Double> {
         private final UnitFormat unitFormat;
+        private final BitcoinUnit bitcoinUnit;
 
-        UnitFormatDoubleConverter(UnitFormat unitFormat) {
+        UnitFormatDoubleConverter(UnitFormat unitFormat, BitcoinUnit bitcoinUnit) {
             this.unitFormat = unitFormat;
+            this.bitcoinUnit = bitcoinUnit;
         }
 
         @Override
         public Double fromString(String str) {
             if(str == null || str.isEmpty()) {
                 return null;
             }
-            String normalised = str.trim()
-                    .replaceAll(Pattern.quote(unitFormat.getGroupingSeparator()), "")
-                    .replaceAll(Pattern.quote(unitFormat.getDecimalSeparator()), ".");
+            String groupingStripped = str.trim().replaceAll(Pattern.quote(unitFormat.getGroupingSeparator()), "");
             try {
-                return Double.valueOf(normalised);
+                //A sats amount with a fraction is not read, as in a CSV import, rather than truncated when paid - a paste of it clears the cell like any text that is not an amount
+                if(bitcoinUnit == BitcoinUnit.SATOSHIS) {
+                    return (double)Long.parseLong(groupingStripped);
+                }
+
+                return Double.valueOf(groupingStripped.replaceAll(Pattern.quote(unitFormat.getDecimalSeparator()), "."));
             } catch(NumberFormatException e) {
                 return null;
             }
@@ -473,11 +480,11 @@ private static class UnitFormatDoubleEditor extends SpreadsheetCellEditor {
         private final UnitFormat unitFormat;
         private final TextField textField;
 
-        UnitFormatDoubleEditor(SpreadsheetView view, UnitFormat unitFormat) {
+        UnitFormatDoubleEditor(SpreadsheetView view, UnitFormat unitFormat, BitcoinUnit bitcoinUnit) {
             super(view);
             this.unitFormat = unitFormat;
             this.textField = new TextField();
-            this.textField.setTextFormatter(new CoinTextFormatter(unitFormat));
+            this.textField.setTextFormatter(new CoinTextFormatter(unitFormat, bitcoinUnit));
         }
 
         @Override

### src/main/java/com/sparrowwallet/sparrow/wallet/PaymentController.java
@@ -410,12 +410,13 @@ protected void updateItem(Wallet wallet, boolean empty) {
             sendController.updateTransaction();
         });
 
-        amount.setTextFormatter(new CoinTextFormatter(Config.get().getUnitFormat()));
+        amountUnit.getSelectionModel().select(BitcoinUnit.BTC.equals(sendController.getBitcoinUnit(Config.get().getBitcoinUnit())) ? 0 : 1);
+        amount.setTextFormatter(new CoinTextFormatter(Config.get().getUnitFormat(), amountUnit.getValue()));
         amount.textProperty().addListener(amountListener);
 
-        amountUnit.getSelectionModel().select(BitcoinUnit.BTC.equals(sendController.getBitcoinUnit(Config.get().getBitcoinUnit())) ? 0 : 1);
         amountUnit.valueProperty().addListener((observable, oldValue, newValue) -> {
             Long value = getRecipientValueSats(oldValue);
+            amount.setTextFormatter(new CoinTextFormatter(Config.get().getUnitFormat(), newValue));
             if(value != null) {
                 UnitFormat unitFormat = Config.get().getUnitFormat() == null ? UnitFormat.DOT : Config.get().getUnitFormat();
                 DecimalFormat df = new DecimalFormat("#.#", unitFormat.getDecimalFormatSymbols());
@@ -939,7 +940,7 @@ public void bitcoinUnitChanged(BitcoinUnitChangedEvent event) {
     public void unitFormatChanged(UnitFormatChangedEvent event) {
         if(amount.getTextFormatter() instanceof CoinTextFormatter coinTextFormatter && coinTextFormatter.getUnitFormat() != event.getUnitFormat()) {
             Long value = getRecipientValueSats(coinTextFormatter.getUnitFormat(), amountUnit.getSelectionModel().getSelectedItem());
-            amount.setTextFormatter(new CoinTextFormatter(event.getUnitFormat()));
+            amount.setTextFormatter(new CoinTextFormatter(event.getUnitFormat(), amountUnit.getValue()));
 
             if(value != null) {
                 setRecipientValueSats(value);

### src/main/java/com/sparrowwallet/sparrow/wallet/SendController.java
@@ -362,13 +362,14 @@ public Double fromString(String string) {
             };
         });
 
-        fee.setTextFormatter(new CoinTextFormatter(Config.get().getUnitFormat()));
-        fee.textProperty().addListener(feeListener);
-
         BitcoinUnit unit = getBitcoinUnit(Config.get().getBitcoinUnit());
         feeAmountUnit.getSelectionModel().select(BitcoinUnit.BTC.equals(unit) ? 0 : 1);
+        fee.setTextFormatter(new CoinTextFormatter(Config.get().getUnitFormat(), feeAmountUnit.getValue()));
+        fee.textProperty().addListener(feeListener);
+
         feeAmountUnit.valueProperty().addListener((observable, oldValue, newValue) -> {
             Long value = getFeeValueSats(oldValue);
+            fee.setTextFormatter(new CoinTextFormatter(Config.get().getUnitFormat(), newValue));
             if(value != null) {
                 setFeeValueSats(value);
             }
@@ -1568,7 +1569,7 @@ public void unitFormatChanged(UnitFormatChangedEvent event) {
         setFeeRate(getFeeRate());
         if(fee.getTextFormatter() instanceof CoinTextFormatter coinTextFormatter && coinTextFormatter.getUnitFormat() != event.getUnitFormat()) {
             Long value = getFeeValueSats(coinTextFormatter.getUnitFormat(), feeAmountUnit.getSelectionModel().getSelectedItem());
-            fee.setTextFormatter(new CoinTextFormatter(event.getUnitFormat()));
+            fee.setTextFormatter(new CoinTextFormatter(event.getUnitFormat(), feeAmountUnit.getValue()));
 
             if(value != null) {
                 setFeeValueSats(value);