image::viewer::Viewer zoom in/out with mouse scrolling doesn't work

[rhysd]

Is your issue REALLY a bug?

• My issue is indeed a bug!
• I am not crazy! I will not fill out this form just to ask a question or request a feature. Pinky promise.

Is there an existing issue for this?

• I have searched the existing issues.

Is this issue related to iced?

• My hardware is compatible and my graphics drivers are up-to-date.

What happened?

iced::widget::image::viewer::Viewer provides the functionality to zoom in/out by scrolling up/down. However it has stopped working from the latest of master branch.

Here is the reproduction:

use iced::widget::image::viewer::Viewer;
use iced::widget::image::Handle;
use iced::widget::{container, Container};
use iced::Length::Fill;
use std::env;

struct App(Handle);

impl Default for App {
    fn default() -> Self {
        Self(Handle::from_path(env::args_os().nth(1).unwrap()))
    }
}

impl App {
    fn update(&mut self, _: ()) {}

    fn view(&self) -> Container<()> {
        container(Viewer::new(&self.0).width(Fill).height(Fill)).center(Fill)
    }
}

fn main() -> iced::Result {
    iced::run("Test", App::update, App::view)
}

Run this program with passing an image file path to the first command line argument. Then try to zoom in/out the image in the window by scrolling up/down. Nothing happens. After that, resizing window reflects the zoom in/out.

This example works fine with iced v0.13.1 (9bfbd7c), however it doesn't work on the latest master branch (f2c9b6b).

What is the expected behavior?

Scrolling up/down on Viewer widget makes the image zoom in/out same as v0.13.1.

Version

master

Operating System

macOS

Do you have any log output?

No response