Clicking the mouse once will also trigger DragStart and DragEnd

[rendaoer]

Bevy version

v0.15.1

What you did

Yes, Drag is fixed, but what about DragStart and DragEnd? Why are they triggered even when there is no movement?

What went wrong

In theory, a click of the mouse should only trigger Down and Up, and DragStart and DragEnd should not be triggered.

Additional information

use bevy::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins.set(ImagePlugin::default_nearest()))
        .add_systems(Startup, setup)
        .run();
}

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    commands.spawn(Camera2d);

    commands
        .spawn((
            Sprite {
                color: Color::srgb(1.0, 0.0, 0.0),
                custom_size: Some(Vec2::new(100.0, 100.0)),
                ..default()
            },
            Transform::from_xyz(0.0, 0.0, 0.0),
        ))
        .observe(down_handler)
        .observe(up_handler)
        .observe(drag_start_handler)
        .observe(drag_handler)
        .observe(drag_end_handler);
}

fn down_handler(_: Trigger<Pointer<Down>>) {
    info!("Down");
}

fn up_handler(_: Trigger<Pointer<Up>>) {
    info!("Up");
}

fn drag_start_handler(_: Trigger<Pointer<DragStart>>) {
    info!("DragStart");
}

fn drag_handler(_: Trigger<Pointer<Drag>>) {
    info!("Drag");
}

fn drag_end_handler(_: Trigger<Pointer<DragEnd>>) {
    info!("DragEnd");
}