Fix Send requirements for Wasm targets

core/src/widget/operation.rs

@@ -8,7 +8,7 @@ pub use scrollable::Scrollable;
 pub use text_input::TextInput;
 
 use crate::widget::Id;
-use crate::{MaybeSend, Rectangle, Vector};
+use crate::{Rectangle, Vector};
 
 use std::any::Any;
 use std::fmt;
@@ -16,7 +16,7 @@ use std::sync::Arc;
 
 /// A piece of logic that can traverse the widget tree of an application in
 /// order to query or update some widget state.
-pub trait Operation<T>: MaybeSend {
+pub trait Operation<T>: Send {
     /// Operates on a widget that contains other widgets.
     ///
     /// The `operate_on_children` function can be called to return control to

runtime/src/task.rs

@@ -52,7 +52,7 @@ impl<T> Task<T> {
     /// its output.
     pub fn widget(operation: impl widget::Operation<T> + 'static) -> Task<T>
     where
-        T: MaybeSend + 'static,
+        T: Send + 'static,
     {
         Self::channel(move |sender| {
             let operation =

runtime/src/window.rs

@@ -7,7 +7,7 @@ use crate::core::time::Instant;
 use crate::core::window::{
     Event, Icon, Id, Level, Mode, Settings, UserAttention,
 };
-use crate::core::{MaybeSend, Point, Size};
+use crate::core::{Point, Size};
 use crate::futures::event;
 use crate::futures::futures::channel::oneshot;
 use crate::futures::Subscription;
@@ -303,10 +303,10 @@ pub fn change_icon<T>(id: Id, icon: Icon) -> Task<T> {
 /// Note that if the window closes before this call is processed the callback will not be run.
 pub fn run_with_handle<T>(
     id: Id,
-    f: impl FnOnce(WindowHandle<'_>) -> T + MaybeSend + 'static,
+    f: impl FnOnce(WindowHandle<'_>) -> T + Send + 'static,
 ) -> Task<T>
 where
-    T: MaybeSend + 'static,
+    T: Send + 'static,
 {
     Task::oneshot(move |channel| {
         crate::Action::Window(Action::RunWithHandle(

winit/src/application.rs

@@ -202,7 +202,7 @@ where
         #[cfg(target_arch = "wasm32")]
         is_booted: std::rc::Rc<std::cell::RefCell<bool>>,
         #[cfg(target_arch = "wasm32")]
-        queued_events: Vec<winit::event::Event<Message>>,
+        queued_events: Vec<winit::event::Event<Action<Message>>>,
     }
 
     struct BootConfig<C> {