Enable more clippy lints (#7418)

More is more!

crates/egui/src/hit_test.rs

@@ -468,6 +468,8 @@ fn should_prioritize_hits_on_back(back: Rect, front: Rect) -> bool {
 
 #[cfg(test)]
 mod tests {
+    #![expect(clippy::print_stdout)]
+
     use emath::{Rect, pos2, vec2};
 
     use crate::{Id, Sense};

crates/egui/src/viewport.rs

@@ -648,6 +648,8 @@ impl ViewportBuilder {
     /// returning a list of commands and a bool indicating if the window needs to be recreated.
     #[must_use]
     pub fn patch(&mut self, new_vp_builder: Self) -> (Vec<ViewportCommand>, bool) {
+        #![expect(clippy::useless_let_if_seq)] // False positive
+
         let Self {
             title: new_title,
             app_id: new_app_id,

crates/egui/src/widget_text.rs

@@ -422,10 +422,12 @@ impl RichText {
             font_id
         };
 
-        let mut background_color = background_color;
-        if code {
-            background_color = style.visuals.code_bg_color;
-        }
+        let background_color = if code {
+            style.visuals.code_bg_color
+        } else {
+            background_color
+        };
+
         let underline = if underline {
             crate::Stroke::new(1.0, line_color)
         } else {

crates/egui/src/widgets/image.rs

@@ -938,11 +938,9 @@ fn animated_image_frame_index(ctx: &Context, uri: &str) -> usize {
                 return index;
             }
         }
-
-        0
-    } else {
-        0
     }
+
+    0
 }
 
 /// Checks if uri is a gif file

crates/egui/src/widgets/text_edit/builder.rs

@@ -929,12 +929,10 @@ fn events(
             event if cursor_range.on_event(os, event, galley, id) => None,
 
             Event::Copy => {
-                if cursor_range.is_empty() {
-                    None
-                } else {
+                if !cursor_range.is_empty() {
                     copy_if_not_password(ui, cursor_range.slice_str(text.as_str()).to_owned());
-                    None
                 }
+                None
             }
             Event::Cut => {
                 if cursor_range.is_empty() {