ADDITIONAL SYSTEM INFORMATION :
MacBook Pro with internal trackpad and external Magic Trackpad

A DESCRIPTION OF THE PROBLEM :
When you try to scroll something on a Mac with a trackpad (external or internal)
then this is so fast that it is practically unusable.

I am talking here about the scroll gesture where you move two fingers up and down
in parallel! At first I thought I was doing something wrong in interpreting the
event data but I now stumbled over a case where this happens without my
intervention.

This can be shown easily with a WebView and Google-Maps. I have attached a little
test program which opens Google-Maps in a JavaFX WebView. Run this program in
parallel with any Web-Browser (Firefox, Chrome, ...) also showing Google-Maps.
Then try to zoom in and out of the map with the two-finger scroll gesture
(not the pinch-gesture!) on both systems and you will see the difference.
The zoom in the WebView is much too fast to be usable in contrast to the zoom
in the browser which is ok.

This issue is probably related to https://bugs.openjdk.java.net/browse/JDK-8218424

I report this issue for the Mac only because I don't have any other system on which
I could verify this. So I don' know whether this behaviour is mac-specific or not.

I have tested this with:

java.vm.name: OpenJDK 64-Bit Server VM
java.runtime.version: 12.0.2+10
javafx.version: 13-ea

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the attached test program in parallel to web-browser

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Same scroll speed on both systems.
ACTUAL -
Extremely different scroll speeds.

---------- BEGIN SOURCE ----------
package webviewzoomdemo;
 
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
 
// Needs --add-modules=javafx.controls,javafx.web
public class WebViewZoomDemo extends Application {
 
    String url = "https://www.google.de/maps";
    
    @Override
public void init() {
        System.out.format("java.vm.name: %s\n", System.getProperty("java.vm.name", "(undefined)"));
        System.out.format("java.runtime.version: %s\n", System.getProperty("java.runtime.version", "(undefined)"));
        System.out.format("javafx.version: %s\n", System.getProperty("javafx.version", "(undefined)"));
    }
    
    @Override
    public void start(final Stage stage) {
        WebView browser = new WebView();
        browser.getEngine().load(url);
  
        BorderPane root = new BorderPane();
        root.setCenter(browser);
 
        Scene scene = new Scene(root);
 
        stage.setScene(scene);
        stage.setWidth(800);
        stage.setHeight(600);
 
        stage.show();
        
    }
 
    public static void main(String[] args) {
        launch(args);
    }
 
}

---------- END SOURCE ----------

FREQUENCY : always