default to mempool.space, improve mempool size tooltip display

src/main/java/com/sparrowwallet/sparrow/control/MempoolSizeFeeRatesChart.java

@@ -6,6 +6,7 @@ import com.sparrowwallet.sparrow.wallet.SendController;
 import javafx.application.Platform;
 import javafx.beans.NamedArg;
 import javafx.collections.FXCollections;
+import javafx.geometry.Point2D;
 import javafx.scene.Cursor;
 import javafx.scene.Node;
 import javafx.scene.chart.*;
@@ -63,16 +64,8 @@ public class MempoolSizeFeeRatesChart extends StackedAreaChart<String, Number> {
         categoryAxis.setAutoRanging(false);
         categoryAxis.setCategories(FXCollections.observableArrayList(categories.values()));
         categoryAxis.invalidateRange(new ArrayList<>(categories.values()));
-
         categoryAxis.setGapStartAndEnd(false);
         categoryAxis.setTickLabelRotation(0);
-        categoryAxis.setOnMouseMoved(mouseEvent -> {
-            String category = categoryAxis.getValueForDisplay(mouseEvent.getX());
-            if(category != null) {
-                Optional<String> time = categories.entrySet().stream().filter(entry -> entry.getValue().equals(category)).map(entry -> dateFormatter.format(entry.getKey())).findFirst();
-                time.ifPresent(s -> tooltip.setGraphic(new ChartTooltip(category, s, getData())));
-            }
-        });
 
         NumberAxis numberAxis = (NumberAxis)getYAxis();
         numberAxis.setTickLabelFormatter(new StringConverter<Number>() {
@@ -88,6 +81,15 @@ public class MempoolSizeFeeRatesChart extends StackedAreaChart<String, Number> {
             }
         });
 
+        this.setOnMouseMoved(mouseEvent -> {
+            Point2D sceneCoords = this.localToScene(mouseEvent.getX(), mouseEvent.getY());
+            String category = categoryAxis.getValueForDisplay(categoryAxis.sceneToLocal(sceneCoords).getX());
+            if(category != null) {
+                Optional<String> time = categories.entrySet().stream().filter(entry -> entry.getValue().equals(category)).map(entry -> dateFormatter.format(entry.getKey())).findFirst();
+                time.ifPresent(s -> tooltip.setGraphic(new ChartTooltip(category, s, getData())));
+            }
+        });
+
         long previousFeeRate = 0;
         for(Long feeRate : SendController.FEE_RATES_RANGE) {
             XYChart.Series<String, Number> series = new XYChart.Series<>();
@@ -161,7 +163,7 @@ public class MempoolSizeFeeRatesChart extends StackedAreaChart<String, Number> {
         public ChartTooltip(String category, String time, List<Series<String, Number>> seriesList) {
             Label title = new Label("At " + time);
             HBox titleBox = new HBox(title);
-            title.getStyleClass().add("tooltip-title");
+            title.setStyle("-fx-alignment: center; -fx-font-size: 12px; -fx-padding: 0 0 5 0;");
             getChildren().add(titleBox);
 
             for(int i = seriesList.size() - 1; i >= 0; i--) {
@@ -172,7 +174,7 @@ public class MempoolSizeFeeRatesChart extends StackedAreaChart<String, Number> {
                         if(mvb >= 0.01) {
                             Label label = new Label(series.getName() + ": " + String.format("%.2f", mvb) + " MvB");
                             Glyph circle = new Glyph(FontAwesome5.FONT_NAME, FontAwesome5.Glyph.CIRCLE);
-                            circle.getStyleClass().add("tooltip-series" + i);
+                            circle.setStyle("-fx-text-fill: CHART_COLOR_" + (i+1));
                             label.setGraphic(circle);
                             getChildren().add(label);
                         }

src/main/java/com/sparrowwallet/sparrow/net/ElectrumServer.java

@@ -606,7 +606,8 @@ public class ElectrumServer {
             }
 
             FeeRatesSource feeRatesSource = Config.get().getFeeRatesSource();
-            if(feeRatesSource != null && Network.get().equals(Network.MAINNET)) {
+            feeRatesSource = (feeRatesSource == null ? FeeRatesSource.MEMPOOL_SPACE : feeRatesSource);
+            if(Network.get().equals(Network.MAINNET)) {
                 targetBlocksFeeRatesSats.putAll(feeRatesSource.getBlockTargetFeeRates(targetBlocksFeeRatesSats));
             }
 

src/main/resources/com/sparrowwallet/sparrow/wallet/send.css

@@ -108,18 +108,3 @@
 #transactionDiagram .utxo-label:hover .button .label .text {
     -fx-fill: -fx-text-base-color;
 }
-
-.tooltip-title {
-    -fx-alignment: center;
-    -fx-font-size: 12px;
-    -fx-padding: 0 0 5 0;
-}
-
-.tooltip-series0 { -fx-text-fill: CHART_COLOR_1; }
-.tooltip-series1 { -fx-text-fill: CHART_COLOR_2; }
-.tooltip-series2 { -fx-text-fill: CHART_COLOR_3; }
-.tooltip-series3 { -fx-text-fill: CHART_COLOR_4; }
-.tooltip-series4 { -fx-text-fill: CHART_COLOR_5; }
-.tooltip-series5 { -fx-text-fill: CHART_COLOR_6; }
-.tooltip-series6 { -fx-text-fill: CHART_COLOR_7; }
-.tooltip-series7 { -fx-text-fill: CHART_COLOR_8; }