How do I fix the script error: Unable to preventDefault inside passive event listener .... ?

[james-ep01]

Introduction

It always happens when I drag from stencil to paper. What should I do?

I was just going to ignore it, but I don't think I can ignore it.
It also occurs in the kitchen app.

Steps to reproduce

No response

Restrictions & Constraints

No response

Does your question relate to JointJS or JointJS+. Select both if applicable.

JointJS+

[kumilingus]

How did you get this specific error? It's not what I see in the Kitchen Sink application.

Are you calling evt.preventDefault() anywhere during the stencil drag & drop?

You should be able to prevent the error like this:

joint.mvc.$.event.special.touchstart = {
    setup: function(_, ns, handle) {
       this.addEventListener("touchstart", handle, { passive: false });
    }
};

[james-ep01]

This is a Kitchen Sink app v4.1 that you install without any modifications. It happens when i drag and drop.

script_error_2025-01-03.095823.mp4

And of course it happens in my app too.

[kumilingus]

What browser do you use?