chore: Rust 2024 edition

Set the formatting style to 2021 edition to avoid disrupting existing work.
Remove when possible.

src/utils/iced.rs

@@ -2,13 +2,11 @@ use std::{
     collections::{HashMap, HashSet},
     fmt,
     hash::{Hash, Hasher},
-    sync::{Arc, LazyLock, Mutex, mpsc::Receiver},
+    sync::{mpsc::Receiver, Arc, LazyLock, Mutex},
 };
 
 use cosmic::{
-    Theme,
     iced::{
-        Limits, Point as IcedPoint, Size as IcedSize, Task,
         advanced::{graphics::text::font_system, widget::Tree},
         event::Event,
         futures::{FutureExt, StreamExt},
@@ -16,17 +14,19 @@ use cosmic::{
         mouse::{Button as MouseButton, Cursor, Event as MouseEvent, ScrollDelta},
         touch::{Event as TouchEvent, Finger},
         window::Event as WindowEvent,
+        Limits, Point as IcedPoint, Size as IcedSize, Task,
     },
-    iced_core::{Color, Length, Pixels, clipboard::Null as NullClipboard, id::Id, renderer::Style},
+    iced_core::{clipboard::Null as NullClipboard, id::Id, renderer::Style, Color, Length, Pixels},
     iced_runtime::{
-        Action, Debug,
         program::{Program as IcedProgram, State},
         task::into_stream,
+        Action, Debug,
     },
+    Theme,
 };
 use iced_tiny_skia::{
+    graphics::{damage, Viewport},
     Layer,
-    graphics::{Viewport, damage},
 };
 
 use ordered_float::OrderedFloat;
@@ -35,16 +35,15 @@ use smithay::{
         allocator::Fourcc,
         input::{ButtonState, KeyState},
         renderer::{
-            ImportMem, Renderer,
             element::{
-                AsRenderElements, Kind,
                 memory::{MemoryRenderBuffer, MemoryRenderBufferRenderElement},
+                AsRenderElements, Kind,
             },
+            ImportMem, Renderer,
         },
     },
     desktop::space::{RenderZindex, SpaceElement},
     input::{
-        Seat,
         keyboard::{KeyboardTarget, KeysymHandle, ModifiersState},
         pointer::{
             AxisFrame, ButtonEvent, GestureHoldBeginEvent, GestureHoldEndEvent,
@@ -56,10 +55,11 @@ use smithay::{
             DownEvent, MotionEvent as TouchMotionEvent, OrientationEvent, ShapeEvent, TouchTarget,
             UpEvent,
         },
+        Seat,
     },
     output::Output,
     reexports::calloop::RegistrationToken,
-    reexports::calloop::{self, LoopHandle, futures::Scheduler},
+    reexports::calloop::{self, futures::Scheduler, LoopHandle},
     utils::{
         Buffer as BufferCoords, IsAlive, Logical, Physical, Point, Rectangle, Scale, Serial, Size,
         Transform,