Crash when using ondragstart

[jeancf]

Problem

Trying to drag an Element to which an ondragstart event handler has been added results in a crash of the application.

Steps To Reproduce

Steps to reproduce the behavior:

main.css

#![allow(non_snake_case)]

use dioxus::prelude::*;
use log::LevelFilter;

fn main() {
    // Init debug
    dioxus_logger::init(LevelFilter::Debug).expect("failed to init logger");

    dioxus::launch(App);
}

#[component]
fn App() -> Element {
    rsx! {
        div {
            ondragstart: move |ev| {
                log::debug!("{:?}", ev);
            },
            "DIV"
        }
    }
}

• Launch with dx serve
• Select the word DIV
• Try to drag it
• Nothing appears in the debug log and crash:

thread 'main' panicked at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-desktop-0.5.1/src/app.rs:301:60:
called `Option::unwrap()` on a `None` value

stack backtrace:
   0: rust_begin_unwind
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:647:5
   1: core::panicking::panic_fmt
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/panicking.rs:72:14
   2: core::panicking::panic
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/panicking.rs:144:5
   3: core::option::unwrap_failed
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/option.rs:1978:5
   4: core::option::Option<T>::unwrap
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/option.rs:931:21
   5: dioxus_desktop::app::App::handle_user_event_msg
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-desktop-0.5.1/src/app.rs:301:38
   6: dioxus_desktop::launch::launch_virtual_dom_blocking::{{closure}}
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-desktop-0.5.1/src/launch.rs:55:45
   7: tao::platform_impl::platform::event_loop::EventLoop<T>::run_return::{{closure}}
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tao-0.26.2/src/platform_impl/linux/event_loop.rs:1005:24
   8: glib::main_context::<impl glib::auto::main_context::MainContext>::with_thread_default
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/glib-0.18.5/src/main_context.rs:154:12
   9: tao::platform_impl::platform::event_loop::EventLoop<T>::run_return
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tao-0.26.2/src/platform_impl/linux/event_loop.rs:929:5
  10: tao::platform_impl::platform::event_loop::EventLoop<T>::run
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tao-0.26.2/src/platform_impl/linux/event_loop.rs:883:21
  11: tao::event_loop::EventLoop<T>::run
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tao-0.26.2/src/event_loop.rs:211:5
  12: dioxus_desktop::launch::launch_virtual_dom_blocking
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-desktop-0.5.1/src/launch.rs:17:5
  13: dioxus_desktop::launch::launch_virtual_dom::{{closure}}
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-desktop-0.5.1/src/launch.rs:76:13
  14: <tokio::task::unconstrained::Unconstrained<F> as core::future::future::Future>::poll::{{closure}}
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/task/unconstrained.rs:25:57
  15: tokio::runtime::coop::with_budget
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/coop.rs:107:5
  16: tokio::runtime::coop::with_unconstrained
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/coop.rs:80:5
  17: <tokio::task::unconstrained::Unconstrained<F> as core::future::future::Future>::poll
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/task/unconstrained.rs:25:13
  18: tokio::runtime::park::CachedParkThread::block_on::{{closure}}
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/park.rs:281:63
  19: tokio::runtime::coop::with_budget
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/coop.rs:107:5
  20: tokio::runtime::coop::budget
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/coop.rs:73:5
  21: tokio::runtime::park::CachedParkThread::block_on
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/park.rs:281:31
  22: tokio::runtime::context::blocking::BlockingRegionGuard::block_on
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/context/blocking.rs:66:9
  23: tokio::runtime::scheduler::multi_thread::MultiThread::block_on::{{closure}}
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/scheduler/multi_thread/mod.rs:87:13
  24: tokio::runtime::context::runtime::enter_runtime
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/context/runtime.rs:65:16
  25: tokio::runtime::scheduler::multi_thread::MultiThread::block_on
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/scheduler/multi_thread/mod.rs:86:9
  26: tokio::runtime::runtime::Runtime::block_on
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.37.0/src/runtime/runtime.rs:351:45
  27: dioxus_desktop::launch::launch_virtual_dom
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-desktop-0.5.1/src/launch.rs:71:5
  28: dioxus_desktop::launch::launch
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-desktop-0.5.1/src/launch.rs:95:5
  29: dioxus::launch::LaunchBuilder<Cfg,ContextFn>::launch
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-0.5.1/src/launch.rs:171:9
  30: dioxus::launch::launch
             at /home/jeancf/.cargo/registry/src/index.crates.io-6f17d22bba15001f/dioxus-0.5.1/src/launch.rs:280:5
  31: graph::main
             at ./src/main.rs:10:5
  32: core::ops::function::FnOnce::call_once
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/ops/function.rs:250:5

Expected behavior

No crash and content of DragData printed in the log.

Environment:

• Dioxus version: 0.5.1
• Rust version: 1.77.2
• OS info: Manjaro Linux
• App platform: desktop