Update to Rust 1.76 (#4411)

Motivation: I want to replace `cargo-cranky` with workspace lints, first
available in Rust 1.74.
However, `cargo doc` would hange on `wgpu` and `wgpu-core` on 1.74 and
1.75… so now we're on 1.76.
I think this is fine - when 1.78 is released next week we're still two
versions behind the bleeding edge.

…and the branch name is just wrong 🤦

crates/eframe/src/native/app_icon.rs

@@ -225,9 +225,7 @@ fn set_title_and_icon_mac(title: &str, icon_data: Option<&IconData>) -> AppIconS
     }
 
     unsafe {
-        let app = if let Some(app) = NSApp {
-            app
-        } else {
+        let Some(app) = NSApp else {
             log::debug!("NSApp is null");
             return AppIconStatus::NotSetIgnored;
         };

crates/eframe/src/native/run.rs

@@ -391,6 +391,8 @@ pub fn run_glow(
     mut native_options: epi::NativeOptions,
     app_creator: epi::AppCreator,
 ) -> Result<()> {
+    #![allow(clippy::needless_return_with_question_mark)] // False positive
+
     use super::glow_integration::GlowWinitApp;
 
     #[cfg(not(target_os = "ios"))]
@@ -414,6 +416,8 @@ pub fn run_wgpu(
     mut native_options: epi::NativeOptions,
     app_creator: epi::AppCreator,
 ) -> Result<()> {
+    #![allow(clippy::needless_return_with_question_mark)] // False positive
+
     use super::wgpu_integration::WgpuWinitApp;
 
     #[cfg(not(target_os = "ios"))]

crates/eframe/src/web/storage.rs

@@ -31,7 +31,7 @@ pub(crate) fn load_memory(_: &egui::Context) {}
 
 #[cfg(feature = "persistence")]
 pub(crate) fn save_memory(ctx: &egui::Context) {
-    match ctx.memory(|mem| ron::to_string(mem)) {
+    match ctx.memory(ron::to_string) {
         Ok(ron) => {
             local_storage_set("egui_memory_ron", &ron);
         }

crates/egui/src/containers/collapsing_header.rs

@@ -230,7 +230,7 @@ impl CollapsingState {
         }
     }
 
-    /// Paint this [CollapsingState](CollapsingState)'s toggle button. Takes an [IconPainter](IconPainter) as the icon.
+    /// Paint this [`CollapsingState`]'s toggle button. Takes an [`IconPainter`] as the icon.
     /// ```
     /// # egui::__run_test_ui(|ui| {
     /// fn circle_icon(ui: &mut egui::Ui, openness: f32, response: &egui::Response) {

crates/egui/src/lib.rs

@@ -517,7 +517,7 @@ macro_rules! include_image {
     };
 }
 
-/// Create a [`Hyperlink`](crate::Hyperlink) to the current [`file!()`] (and line) on Github
+/// Create a [`Hyperlink`] to the current [`file!()`] (and line) on Github
 ///
 /// ```
 /// # egui::__run_test_ui(|ui| {
@@ -532,7 +532,7 @@ macro_rules! github_link_file_line {
     }};
 }
 
-/// Create a [`Hyperlink`](crate::Hyperlink) to the current [`file!()`] on github.
+/// Create a [`Hyperlink`] to the current [`file!()`] on github.
 ///
 /// ```
 /// # egui::__run_test_ui(|ui| {

crates/egui/src/memory.rs

@@ -868,7 +868,7 @@ impl Memory {
 // ----------------------------------------------------------------------------
 
 /// Keeps track of [`Area`](crate::containers::area::Area)s, which are free-floating [`Ui`](crate::Ui)s.
-/// These [`Area`](crate::containers::area::Area)s can be in any [`Order`](crate::Order).
+/// These [`Area`](crate::containers::area::Area)s can be in any [`Order`].
 #[derive(Clone, Debug, Default)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(default))]

crates/egui/src/style.rs

@@ -288,7 +288,7 @@ pub struct Spacing {
     /// Default rail height of a [`Slider`].
     pub slider_rail_height: f32,
 
-    /// Default (minimum) width of a [`ComboBox`](crate::ComboBox).
+    /// Default (minimum) width of a [`ComboBox`].
     pub combo_width: f32,
 
     /// Default width of a [`TextEdit`].

crates/egui_extras/src/table.rs

@@ -131,7 +131,7 @@ impl Column {
         self
     }
 
-    /// Allowed range of movement (in points), if in a resizable [`Table`](crate::table::Table).
+    /// Allowed range of movement (in points), if in a resizable [`Table`].
     #[inline]
     pub fn range(mut self, range: impl Into<Rangef>) -> Self {
         self.width_range = range.into();

crates/epaint/src/shape.rs

@@ -1293,12 +1293,7 @@ impl std::fmt::Debug for PaintCallback {
 
 impl std::cmp::PartialEq for PaintCallback {
     fn eq(&self, other: &Self) -> bool {
-        // As I understand it, the problem this clippy is trying to protect against
-        // can only happen if we do dynamic casts back and forth on the pointers, and we don't do that.
-        #[allow(clippy::vtable_address_comparisons)]
-        {
-            self.rect.eq(&other.rect) && Arc::ptr_eq(&self.callback, &other.callback)
-        }
+        self.rect.eq(&other.rect) && Arc::ptr_eq(&self.callback, &other.callback)
     }
 }