Fix some clippy 1.75 lints (#3754)

crates/ecolor/src/lib.rs

@@ -12,8 +12,6 @@
 
 #[cfg(feature = "cint")]
 mod cint_impl;
-#[cfg(feature = "cint")]
-pub use cint_impl::*;
 
 mod color32;
 pub use color32::*;

crates/egui-wgpu/src/lib.rs

@@ -274,7 +274,7 @@ pub fn preferred_framebuffer_format(
     }
 
     formats
-        .get(0)
+        .first()
         .copied()
         .ok_or(WgpuError::NoSurfaceFormatsAvailable)
 }

crates/egui/src/id.rs

@@ -43,10 +43,7 @@ impl Id {
 
     /// Generate a new [`Id`] by hashing some source (e.g. a string or integer).
     pub fn new(source: impl std::hash::Hash) -> Id {
-        use std::hash::{BuildHasher, Hasher};
-        let mut hasher = epaint::ahash::RandomState::with_seeds(1, 2, 3, 4).build_hasher();
-        source.hash(&mut hasher);
-        Id(hasher.finish())
+        Id(epaint::ahash::RandomState::with_seeds(1, 2, 3, 4).hash_one(source))
     }
 
     /// Generate a new [`Id`] by hashing the parent [`Id`] and the given argument.

crates/egui_demo_app/src/main.rs

@@ -1,6 +1,7 @@
 //! Demo app for egui
 
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+#![allow(clippy::never_loop)] // False positive
 
 // When compiling natively:
 fn main() -> Result<(), eframe::Error> {

crates/egui_demo_lib/src/lib.rs

@@ -18,7 +18,7 @@ mod demo;
 pub mod easy_mark;
 
 pub use color_test::ColorTest;
-pub use demo::DemoWindows;
+pub use demo::{DemoWindows, WidgetGallery};
 
 /// View some Rust code with syntax highlighting and selection.
 pub(crate) fn rust_view_ui(ui: &mut egui::Ui, code: &str) {

crates/egui_extras/src/syntax_highlighting.rs

@@ -3,6 +3,8 @@
 //! Turn on the `syntect` feature for great syntax highlighting of any language.
 //! Otherwise, a very simple fallback will be used, that works okish for C, C++, Rust, and Python.
 
+#![allow(clippy::mem_forget)] // False positive from enum_map macro
+
 use egui::text::LayoutJob;
 
 /// View some code with syntax highlighting and selection.