Improve clippy, and add more docs (#3306)

* Silence a few clippy warnings

* Use named threads

* Remove some deprecated functions

* Document Context and Ui fully

* Use `parking_lot::Mutex` in `eframe`

* Expand clippy.toml files

* build fix

crates/eframe/Cargo.toml

@@ -96,6 +96,8 @@ egui = { version = "0.22.0", path = "../egui", default-features = false, feature
   "log",
 ] }
 log = { version = "0.4", features = ["std"] }
+parking_lot = "0.12"
+static_assertions = "1.1.0"
 thiserror.workspace = true
 
 #! ### Optional dependencies
@@ -106,7 +108,6 @@ egui_glow = { version = "0.22.0", path = "../egui_glow", optional = true, defaul
 glow = { version = "0.12", optional = true }
 ron = { version = "0.8", optional = true, features = ["integer128"] }
 serde = { version = "1", optional = true, features = ["derive"] }
-static_assertions = "1.1.0"
 
 # -------------------------------------------
 # native:

crates/eframe/src/native/run.rs

@@ -1092,6 +1092,8 @@ pub use glow_integration::run_glow;
 mod wgpu_integration {
     use std::sync::Arc;
 
+    use parking_lot::Mutex;
+
     use super::*;
 
     /// State that is initialized when the application is first starts running via
@@ -1104,7 +1106,7 @@ mod wgpu_integration {
     }
 
     struct WgpuWinitApp {
-        repaint_proxy: Arc<std::sync::Mutex<EventLoopProxy<UserEvent>>>,
+        repaint_proxy: Arc<Mutex<EventLoopProxy<UserEvent>>>,
         app_name: String,
         native_options: epi::NativeOptions,
         app_creator: Option<epi::AppCreator>,
@@ -1130,7 +1132,7 @@ mod wgpu_integration {
             );
 
             Self {
-                repaint_proxy: Arc::new(std::sync::Mutex::new(event_loop.create_proxy())),
+                repaint_proxy: Arc::new(Mutex::new(event_loop.create_proxy())),
                 app_name: app_name.to_owned(),
                 native_options,
                 running: None,
@@ -1215,7 +1217,7 @@ mod wgpu_integration {
             );
             #[cfg(feature = "accesskit")]
             {
-                integration.init_accesskit(&window, self.repaint_proxy.lock().unwrap().clone());
+                integration.init_accesskit(&window, self.repaint_proxy.lock().clone());
             }
             let theme = system_theme.unwrap_or(self.native_options.default_theme);
             integration.egui_ctx.set_visuals(theme.egui_visuals());
@@ -1232,7 +1234,6 @@ mod wgpu_integration {
                         let frame_nr = info.current_frame_nr;
                         event_loop_proxy
                             .lock()
-                            .unwrap()
                             .send_event(UserEvent::RequestRepaint { when, frame_nr })
                             .ok();
                     });