Update Rust stable to 1.82 and satisfy Clippy. (#2409)

Contains one API change:

```
--- pub struct CustomCursor(Arc<HCursor>);
+++ pub struct CustomCursor(Rc<HCursor>);
```

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ env:
   # version like 1.70. Note that we only specify MAJOR.MINOR and not PATCH so that bugfixes still
   # come automatically. If the version specified here is no longer the latest stable version,
   # then please feel free to submit a PR that adjusts it along with the potential clippy fixes.
-  RUST_STABLE_VER: "1.76" # In quotes because otherwise 1.70 would be interpreted as 1.7
+  RUST_STABLE_VER: "1.82" # In quotes because otherwise 1.70 would be interpreted as 1.7
 
 name: CI
 

CHANGELOG.md

@@ -15,6 +15,8 @@ You can find its changes [documented below](#083---2023-02-28).
 
 ### Changed
 
+- Windows: Custom cursor is now encapsulated by `Rc` instead of `Arc`. ([#2409] by [@xStrom])
+
 ### Deprecated
 
 ### Removed
@@ -1241,6 +1243,7 @@ Last release without a changelog :(
 [#2378]: https://github.com/linebender/druid/pull/2378
 [#2380]: https://github.com/linebender/druid/pull/2380
 [#2402]: https://github.com/linebender/druid/pull/2402
+[#2409]: https://github.com/linebender/druid/pull/2409
 
 [Unreleased]: https://github.com/linebender/druid/compare/v0.8.3...master
 [0.8.3]: https://github.com/linebender/druid/compare/v0.8.2...v0.8.3

druid-derive/tests/ignore.rs

@@ -24,6 +24,7 @@ fn ignore_item_without_data_impl() {
     use std::path::PathBuf;
 
     #[derive(Clone, Data)]
+    #[allow(dead_code)]
     struct CoolStruct {
         len: usize,
         #[data(ignore)]
@@ -35,7 +36,12 @@ fn ignore_item_without_data_impl() {
 #[test]
 fn tuple_struct() {
     #[derive(Clone, Data)]
-    struct Tup(usize, #[data(ignore)] usize);
+    struct Tup(
+        usize,
+        #[data(ignore)]
+        #[allow(dead_code)]
+        usize,
+    );
 
     let one = Tup(1, 1);
     let two = Tup(1, 5);

druid-derive/tests/with_same.rs

@@ -14,22 +14,22 @@ fn same_fn() {
 
     let one = Nanana {
         bits: 1.0,
-        peq: std::f64::NAN,
+        peq: f64::NAN,
     };
     let two = Nanana {
         bits: 1.0,
-        peq: std::f64::NAN,
+        peq: f64::NAN,
     };
 
     //according to partialeq, two NaNs are never equal
     assert!(!one.same(&two));
 
     let one = Nanana {
-        bits: std::f64::NAN,
+        bits: f64::NAN,
         peq: 1.0,
     };
     let two = Nanana {
-        bits: std::f64::NAN,
+        bits: f64::NAN,
         peq: 1.0,
     };
 
@@ -51,17 +51,13 @@ fn enums() {
         Tri(#[data(same_fn = "same_sign")] f64),
     }
 
-    let oneone = Hi::One {
-        bits: std::f64::NAN,
-    };
-    let onetwo = Hi::One {
-        bits: std::f64::NAN,
-    };
+    let oneone = Hi::One { bits: f64::NAN };
+    let onetwo = Hi::One { bits: f64::NAN };
     assert!(oneone.same(&onetwo));
 
     let twoone = Hi::Two { bits: -1.1 };
     let twotwo = Hi::Two {
-        bits: std::f64::NEG_INFINITY,
+        bits: f64::NEG_INFINITY,
     };
     assert!(twoone.same(&twotwo));
 

druid-shell/src/application.rs

@@ -50,7 +50,7 @@ static APPLICATION_CREATED: AtomicBool = AtomicBool::new(false);
 
 thread_local! {
     /// A reference object to the current `Application`, if any.
-    static GLOBAL_APP: RefCell<Option<Application>> = RefCell::new(None);
+    static GLOBAL_APP: RefCell<Option<Application>> = const { RefCell::new(None) };
 }
 
 impl Application {

druid-shell/src/backend/mac/text_input.rs

@@ -597,7 +597,7 @@ fn decode_nsrange(
     range: &NSRange,
     start_offset: usize,
 ) -> Option<Range<usize>> {
-    if range.location as usize >= i32::max_value() as usize {
+    if range.location as usize >= i32::MAX as usize {
         return None;
     }
     let start_offset_utf16 = edit_lock.utf8_to_utf16(0..start_offset);

druid-shell/src/backend/wayland/outputs/mod.rs

@@ -94,6 +94,7 @@ pub(super) fn current() -> Result<Vec<Meta>, error::Error> {
     Ok(result.take())
 }
 
+#[allow(dead_code)]
 pub trait Wayland {
     fn consume<'a>(
         &'a mut self,
@@ -130,6 +131,7 @@ impl From<(i32, i32)> for Position {
 }
 
 #[derive(Debug, Default, Clone)]
+#[allow(dead_code)]
 pub struct Mode {
     pub logical: Dimensions,
     pub refresh: i32,

druid-shell/src/backend/web/window.rs

@@ -619,7 +619,7 @@ impl WindowHandle {
             Ok(iv) => iv,
             Err(_) => {
                 warn!("Timer duration exceeds 32 bit integer max");
-                i32::max_value()
+                i32::MAX
             }
         };
 

druid-shell/src/backend/windows/util.rs

@@ -50,6 +50,7 @@ impl From<HRESULT> for Error {
 }
 
 pub trait ToWide {
+    #[allow(dead_code)]
     fn to_wide_sized(&self) -> Vec<u16>;
     fn to_wide(&self) -> Vec<u16>;
 }
@@ -147,6 +148,7 @@ type DCompositionCreateDevice = unsafe extern "system" fn(
 
 #[allow(non_snake_case)] // For member fields
 pub struct OptionalFunctions {
+    #[allow(dead_code)]
     pub GetDpiForSystem: Option<GetDpiForSystem>,
     pub GetDpiForWindow: Option<GetDpiForWindow>,
     pub SetProcessDpiAwarenessContext: Option<SetProcessDpiAwarenessContext>,
@@ -178,6 +180,7 @@ fn load_optional_functions() -> OptionalFunctions {
                     $min_windows_version
                 );
             } else {
+                #[allow(clippy::missing_transmute_annotations)]
                 let function = unsafe { mem::transmute::<_, $function>(function_ptr) };
                 $function = Some(function);
             }

druid-shell/src/backend/windows/window.rs

@@ -141,7 +141,7 @@ pub enum PresentStrategy {
 /// 1. the system hands a mouse click event to `druid-shell`
 /// 2. `druid-shell` calls `WinHandler::mouse_up`
 /// 3. after some processing, the `WinHandler` calls `WindowHandle::save_as`, which schedules a
-///   deferred op and returns immediately
+///    deferred op and returns immediately
 /// 4. after some more processing, `WinHandler::mouse_up` returns
 /// 5. `druid-shell` displays the "save as" dialog that was requested in step 3.
 enum DeferredOp {
@@ -301,9 +301,7 @@ struct DxgiState {
 }
 
 #[derive(Clone, PartialEq, Eq)]
-// TODO: Convert this from Arc to Rc when doing a breaking release
-#[allow(clippy::arc_with_non_send_sync)]
-pub struct CustomCursor(Arc<HCursor>);
+pub struct CustomCursor(Rc<HCursor>);
 
 #[derive(PartialEq, Eq)]
 struct HCursor(HCURSOR);
@@ -2479,9 +2477,7 @@ impl WindowHandle {
                 };
                 let icon = CreateIconIndirect(&mut icon_info);
 
-                // TODO: Convert this from Arc to Rc when doing a breaking release
-                #[allow(clippy::arc_with_non_send_sync)]
-                Some(Cursor::Custom(CustomCursor(Arc::new(HCursor(icon)))))
+                Some(Cursor::Custom(CustomCursor(Rc::new(HCursor(icon)))))
             }
         } else {
             None

druid-shell/src/backend/x11/application.rs

@@ -904,7 +904,7 @@ fn poll_with_timeout(
                 break;
             } else {
                 let millis = c_int::try_from(deadline.duration_since(now).as_millis())
-                    .unwrap_or(c_int::max_value() - 1);
+                    .unwrap_or(c_int::MAX - 1);
                 // The above .as_millis() rounds down. This means we would wake up before the
                 // deadline is reached. Add one to 'simulate' rounding up instead.
                 millis + 1

druid-shell/src/backend/x11/clipboard.rs

@@ -671,7 +671,7 @@ fn wait_for_event_with_deadline(
         // Use poll() to wait for the socket to become readable.
         let mut poll_fds = [PollFd::new(conn.as_raw_fd(), PollFlags::POLLIN)];
         let poll_timeout = c_int::try_from(deadline.duration_since(now).as_millis())
-            .unwrap_or(c_int::max_value() - 1)
+            .unwrap_or(c_int::MAX - 1)
             // The above rounds down, but we don't want to wake up to early, so add one
             .saturating_add(1);
 

druid-shell/src/lib.rs

@@ -13,7 +13,7 @@
 //! variables. Here is a list of environment variables that `druid-shell` supports:
 //!
 //! - `DRUID_SHELL_DISABLE_X11_PRESENT`: if this is set and `druid-shell` is using the `x11`
-//! backend, it will avoid using the Present extension.
+//!   backend, it will avoid using the Present extension.
 
 #![warn(rustdoc::broken_intra_doc_links)]
 #![allow(clippy::new_without_default)]

druid-shell/src/text.rs

@@ -390,11 +390,11 @@ pub trait InputHandler {
     /// This method also sets the composition range to `None`, and updates the
     /// selection:
     ///
-    /// - If both the selection's anchor and active are `< range.start`, then
-    /// nothing is updated.  - If both the selection's anchor and active are `>
-    /// range.end`, then subtract `range.len()` from both, and add `text.len()`.
-    /// - If neither of the previous two conditions are true, then set both
-    /// anchor and active to `range.start + text.len()`.
+    /// - If both the selection's anchor and active are `< range.start`, then nothing is updated.
+    /// - If both the selection's anchor and active are `> range.end`, then subtract `range.len()`
+    ///   from both, and add `text.len()`.
+    /// - If neither of the previous two conditions are true, then set both anchor and active to
+    ///   `range.start + text.len()`.
     ///
     /// After the above update, if we increase each end of the selection if
     /// necessary to put it on a grapheme cluster boundary.

druid-shell/src/window.rs

@@ -439,7 +439,7 @@ impl WindowHandle {
 
     /// Get the DPI scale of the window.
     ///
-    /// The returned [`Scale`](crate::Scale) is a copy and thus its information will be stale after
+    /// The returned [`Scale`] is a copy and thus its information will be stale after
     /// the platform DPI changes. This means you should not stash it and rely on it later; it is
     /// only guaranteed to be valid for the current pass of the runloop.
     // TODO: Can we get rid of the Result/Error for ergonomics?
@@ -461,7 +461,7 @@ pub struct WindowBuilder(backend::WindowBuilder);
 impl WindowBuilder {
     /// Create a new `WindowBuilder`.
     ///
-    /// Takes the [`Application`](crate::Application) that this window is for.
+    /// Takes the [`Application`] that this window is for.
     pub fn new(app: Application) -> WindowBuilder {
         WindowBuilder(backend::WindowBuilder::new(app.backend_app))
     }

druid/src/contexts.rs

@@ -177,6 +177,7 @@ pub trait ChangeCtx {
 /// Convenience trait for invalidation and request methods available on multiple contexts.
 ///
 /// These methods are available on [`EventCtx`], [`LifeCycleCtx`], and [`UpdateCtx`].
+#[allow(dead_code)]
 pub trait RequestCtx: ChangeCtx {
     /// Request a [`paint`] pass. See ['request_paint']
     ///

druid/src/data.rs

@@ -307,7 +307,7 @@ impl<T: 'static> Data for std::mem::Discriminant<T> {
     }
 }
 
-impl<T: 'static + ?Sized + Data> Data for std::mem::ManuallyDrop<T> {
+impl<T: 'static + Data> Data for std::mem::ManuallyDrop<T> {
     fn same(&self, other: &Self) -> bool {
         (**self).same(&**other)
     }

druid/src/event.rs

@@ -152,14 +152,14 @@ pub enum Event {
     /// may be generated from a number of sources:
     ///
     /// - If your application uses  menus (either window or context menus)
-    /// then the [`MenuItem`]s in the menu will each correspond to a `Command`.
-    /// When the menu item is selected, that [`Command`] will be delivered to
-    /// the root widget of the appropriate window.
+    ///   then the [`MenuItem`]s in the menu will each correspond to a `Command`.
+    ///   When the menu item is selected, that [`Command`] will be delivered to
+    ///   the root widget of the appropriate window.
     /// - If you are doing work in another thread (using an [`ExtEventSink`])
-    /// then [`Command`]s are the mechanism by which you communicate back to
-    /// the main thread.
+    ///   then [`Command`]s are the mechanism by which you communicate back to
+    ///   the main thread.
     /// - Widgets and other Druid components can send custom [`Command`]s at
-    /// runtime, via methods such as [`EventCtx::submit_command`].
+    ///   runtime, via methods such as [`EventCtx::submit_command`].
     ///
     /// [`Widget`]: Widget
     /// [`EventCtx::submit_command`]: crate::EventCtx::submit_command

druid/src/sub_window.rs

@@ -32,15 +32,15 @@ impl SubWindowDesc {
     /// Creates a subwindow requirement that hosts the provided widget within a sub window host.
     /// It will synchronise data updates with the provided parent_id if "sync" is true, and it will expect to be sent
     /// SUB_WINDOW_PARENT_TO_HOST commands to update the provided data for the widget.
-    pub fn new<U, W: Widget<U>>(
+    pub fn new<U, W>(
         parent_id: WidgetId,
         window_config: WindowConfig,
         widget: W,
         data: U,
         env: Env,
     ) -> SubWindowDesc
     where
-        W: 'static,
+        W: Widget<U> + 'static,
         U: Data,
     {
         let host_id = WidgetId::next();

druid/src/tests/harness.rs

@@ -112,14 +112,14 @@ impl<T: Data> Harness<'_, T> {
     /// # Arguments
     ///
     /// * `data` - A structure that matches the type of the widget and that will be
-    ///  passed to the `harness_closure` callback via the `Harness` structure.
+    ///   passed to the `harness_closure` callback via the `Harness` structure.
     ///
     /// * `root` - The widget under test
     ///
     /// * `shape` - The shape of the render_context in the `Harness` structure
     ///
     /// * `harness_closure` - A closure used to interact with the widget under test through the
-    /// `Harness` structure.
+    ///   `Harness` structure.
     ///
     /// * `render_context_closure` - A closure used to inspect the final render_context via the `TargetGuard` structure.
     ///

druid/src/util.rs

@@ -39,6 +39,7 @@ pub trait ExtendDrain {
     /// This function may swap the underlying memory locations,
     /// so keep that in mind if one of the collections has a large allocation
     /// and it should keep that allocation.
+    #[allow(dead_code)]
     fn extend_drain(&mut self, source: &mut Self);
 }
 

druid/src/widget/flex.rs

@@ -76,16 +76,16 @@ use tracing::{instrument, trace};
 /// To experiment with these options, see the `flex` example in `druid/examples`.
 ///
 /// - [`CrossAxisAlignment`] determines how children are positioned on the
-/// cross or 'minor' axis. The default is `CrossAxisAlignment::Center`.
+///   cross or 'minor' axis. The default is `CrossAxisAlignment::Center`.
 ///
 /// - [`MainAxisAlignment`] determines how children are positioned on the main
-/// axis; this is only meaningful if the container has more space on the main
-/// axis than is taken up by its children.
+///   axis; this is only meaningful if the container has more space on the main
+///   axis than is taken up by its children.
 ///
 /// - [`must_fill_main_axis`] determines whether the container is obliged to
-/// be maximally large on the major axis, as determined by its own constraints.
-/// If this is `true`, then the container must fill the available space on that
-/// axis; otherwise it may be smaller if its children are smaller.
+///   be maximally large on the major axis, as determined by its own constraints.
+///   If this is `true`, then the container must fill the available space on that
+///   axis; otherwise it may be smaller if its children are smaller.
 ///
 /// Additional options can be set (or overridden) in the [`FlexParams`].
 ///
@@ -676,9 +676,7 @@ impl<T: Data> Widget<T> for Flex<T> {
                         any_use_baseline |= alignment == CrossAxisAlignment::Baseline;
 
                         let old_size = widget.layout_rect().size();
-                        let child_bc =
-                            self.direction
-                                .constraints(&loosened_bc, 0.0, std::f64::INFINITY);
+                        let child_bc = self.direction.constraints(&loosened_bc, 0.0, f64::INFINITY);
                         let child_size = widget.layout(ctx, &child_bc, data, env);
 
                         if child_size.width.is_infinite() {