ignore scroll events with zero scroll movement

Author: craigraw

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

@@ -49,13 +49,15 @@ public Double fromString(String string) {
         });
 
         setOnScroll(event -> {
-            double newFeeRate = getFeeRate() + (event.getDeltaY() > 0 ? FEE_RATE_SCROLL_INCREMENT : -FEE_RATE_SCROLL_INCREMENT);
-            if(newFeeRate < LONG_FEE_RATES_RANGE.get(0)) {
-                newFeeRate = LONG_FEE_RATES_RANGE.get(0);
-            } else if(newFeeRate > LONG_FEE_RATES_RANGE.get(LONG_FEE_RATES_RANGE.size() - 1)) {
-                newFeeRate = LONG_FEE_RATES_RANGE.get(LONG_FEE_RATES_RANGE.size() - 1);
+            if(event.getDeltaY() != 0) {
+                double newFeeRate = getFeeRate() + (event.getDeltaY() > 0 ? FEE_RATE_SCROLL_INCREMENT : -FEE_RATE_SCROLL_INCREMENT);
+                if(newFeeRate < LONG_FEE_RATES_RANGE.get(0)) {
+                    newFeeRate = LONG_FEE_RATES_RANGE.get(0);
+                } else if(newFeeRate > LONG_FEE_RATES_RANGE.get(LONG_FEE_RATES_RANGE.size() - 1)) {
+                    newFeeRate = LONG_FEE_RATES_RANGE.get(LONG_FEE_RATES_RANGE.size() - 1);
+                }
+                setFeeRate(newFeeRate);
             }
-            setFeeRate(newFeeRate);
         });
     }
 

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

@@ -101,7 +101,7 @@ public QRDisplayDialog(UR ur, BBQR bbqr, boolean addLegacyEncodingOption, boolea
         stackPane.getChildren().add(qrImageView);
 
         qrImageView.setOnScroll(scrollEvent -> {
-            if(animateQRService != null && animateQRService.isRunning()) {
+            if(animateQRService != null && animateQRService.isRunning() && scrollEvent.getDeltaY() != 0) {
                 Duration duration = animateQRService.getPeriod();
                 Duration newDuration = scrollEvent.getDeltaY() > 0 ? duration.multiply(1.1) : duration.multiply(0.9);
                 if(newDuration.lessThan(Duration.millis(ANIMATION_PERIOD_MILLIS*10)) && newDuration.greaterThan(Duration.millis(ANIMATION_PERIOD_MILLIS/2))) {