Update MSRV to Rust 1.79 (#5421)

Mostly to fix `cargo-machete` CI

crates/eframe/src/epi.rs

@@ -439,7 +439,7 @@ pub struct WebOptions {
     /// Unused by webgl context as of writing.
     pub depth_buffer: u8,
 
-    /// Which version of WebGl context to select
+    /// Which version of WebGL context to select
     ///
     /// Default: [`WebGlContextOption::BestFirst`].
     #[cfg(feature = "glow")]

crates/eframe/src/native/event_loop_context.rs

@@ -14,7 +14,7 @@ impl EventLoopGuard {
                 cell.get().is_none(),
                 "Attempted to set a new event loop while one is already set"
             );
-            cell.set(Some(event_loop as *const ActiveEventLoop));
+            cell.set(Some(std::ptr::from_ref::<ActiveEventLoop>(event_loop)));
         });
         Self
     }

crates/eframe/src/web/web_painter_wgpu.rs

@@ -1,42 +1,14 @@
-use raw_window_handle::{
-    DisplayHandle, HandleError, HasDisplayHandle, HasWindowHandle, RawDisplayHandle,
-    RawWindowHandle, WebDisplayHandle, WebWindowHandle, WindowHandle,
-};
 use std::sync::Arc;
+
 use wasm_bindgen::JsValue;
 use web_sys::HtmlCanvasElement;
 
-use crate::WebOptions;
 use egui_wgpu::{RenderState, SurfaceErrorAction, WgpuSetup};
 
+use crate::WebOptions;
+
 use super::web_painter::WebPainter;
 
-struct EguiWebWindow(u32);
-
-#[allow(unsafe_code)]
-impl HasWindowHandle for EguiWebWindow {
-    fn window_handle(&self) -> Result<WindowHandle<'_>, HandleError> {
-        // SAFETY: there is no lifetime here.
-        unsafe {
-            Ok(WindowHandle::borrow_raw(RawWindowHandle::Web(
-                WebWindowHandle::new(self.0),
-            )))
-        }
-    }
-}
-
-#[allow(unsafe_code)]
-impl HasDisplayHandle for EguiWebWindow {
-    fn display_handle(&self) -> Result<DisplayHandle<'_>, HandleError> {
-        // SAFETY: there is no lifetime here.
-        unsafe {
-            Ok(DisplayHandle::borrow_raw(RawDisplayHandle::Web(
-                WebDisplayHandle::new(),
-            )))
-        }
-    }
-}
-
 pub(crate) struct WebPainterWgpu {
     canvas: HtmlCanvasElement,
     surface: wgpu::Surface<'static>,

crates/eframe/src/web/web_runner.rs

@@ -16,7 +16,7 @@ pub struct WebRunner {
     /// Have we ever panicked?
     panic_handler: PanicHandler,
 
-    /// If we ever panic during running, this RefCell is poisoned.
+    /// If we ever panic during running, this `RefCell` is poisoned.
     /// So before we use it, we need to check [`Self::panic_handler`].
     runner: Rc<RefCell<Option<AppRunner>>>,