Enable more clippy lints (#7418)

More is more!

Cargo.toml

@@ -136,16 +136,20 @@ broken_intra_doc_links = "warn"
 
 # See also clippy.toml
 [workspace.lints.clippy]
+all = { level = "warn", priority = -1 }
+
 allow_attributes = "warn"
 as_ptr_cast_mut = "warn"
 await_holding_lock = "warn"
 bool_to_int_with_if = "warn"
+branches_sharing_code = "warn"
 char_lit_as_u8 = "warn"
 checked_conversions = "warn"
 clear_with_drain = "warn"
 cloned_instead_of_copied = "warn"
 dbg_macro = "warn"
 debug_assert_with_mut_call = "warn"
+default_union_representation = "warn"
 derive_partial_eq_without_eq = "warn"
 disallowed_macros = "warn"                  # See clippy.toml
 disallowed_methods = "warn"                 # See clippy.toml
@@ -155,6 +159,7 @@ disallowed_types = "warn"                   # See clippy.toml
 doc_link_with_quotes = "warn"
 doc_markdown = "warn"
 empty_enum = "warn"
+empty_line_after_outer_attr = "warn"
 empty_enum_variants_with_brackets = "warn"
 enum_glob_use = "warn"
 equatable_if_let = "warn"
@@ -171,6 +176,7 @@ fn_params_excessive_bools = "warn"
 fn_to_numeric_cast_any = "warn"
 from_iter_instead_of_collect = "warn"
 get_unwrap = "warn"
+if_let_mutex = "warn"
 implicit_clone = "warn"
 implied_bounds_in_impls = "warn"
 imprecise_flops = "warn"
@@ -211,6 +217,7 @@ match_same_arms = "warn"
 match_wild_err_arm = "warn"
 match_wildcard_for_single_variants = "warn"
 mem_forget = "warn"
+mismatched_target_os = "warn"
 mismatching_type_param_order = "warn"
 missing_assert_message = "warn"
 missing_enforced_import_renames = "warn"
@@ -230,8 +237,9 @@ nonstandard_macro_braces = "warn"
 option_as_ref_cloned = "warn"
 option_option = "warn"
 path_buf_push_overwrite = "warn"
-print_stderr = "warn"
 pathbuf_init_then_push = "warn"
+print_stderr = "warn"
+print_stdout = "warn"
 ptr_as_ptr = "warn"
 ptr_cast_constness = "warn"
 pub_underscore_fields = "warn"
@@ -261,6 +269,7 @@ todo = "warn"
 too_long_first_doc_paragraph = "warn"
 trailing_empty_array = "warn"
 trait_duplication_in_bounds = "warn"
+transmute_ptr_to_ptr = "warn"
 tuple_array_conversions = "warn"
 unchecked_duration_subtraction = "warn"
 undocumented_unsafe_blocks = "warn"
@@ -268,8 +277,10 @@ unimplemented = "warn"
 uninhabited_references = "warn"
 uninlined_format_args = "warn"
 unnecessary_box_returns = "warn"
+unnecessary_safety_comment = "warn"
 unnecessary_literal_bound = "warn"
 unnecessary_safety_doc = "warn"
+unnecessary_self_imports = "warn"
 unnecessary_struct_initialization = "warn"
 unnecessary_wraps = "warn"
 unnested_or_patterns = "warn"
@@ -278,6 +289,7 @@ unused_rounding = "warn"
 unused_self = "warn"
 unused_trait_names = "warn"
 use_self = "warn"
+useless_let_if_seq = "warn"
 useless_transmute = "warn"
 verbose_file_reads = "warn"
 wildcard_dependencies = "warn"

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() {

crates/egui_kittest/src/snapshot.rs

@@ -321,6 +321,8 @@ fn try_image_snapshot_options_impl(
     name: String,
     options: &SnapshotOptions,
 ) -> SnapshotResult {
+    #![expect(clippy::print_stdout)]
+
     let SnapshotOptions {
         threshold,
         output_path,

crates/emath/src/rect.rs

@@ -830,6 +830,7 @@ mod tests {
         );
     }
 
+    #[expect(clippy::print_stdout)]
     #[test]
     fn test_ray_intersection() {
         let rect = Rect::from_min_max(pos2(1.0, 1.0), pos2(3.0, 3.0));

crates/epaint/src/shapes/bezier_shape.rs

@@ -613,6 +613,8 @@ struct FlatteningParameters {
 impl FlatteningParameters {
     // https://raphlinus.github.io/graphics/curves/2019/12/23/flatten-quadbez.html
     pub fn from_curve(curve: &QuadraticBezierShape, tolerance: f32) -> Self {
+        #![expect(clippy::useless_let_if_seq)]
+
         // Map the quadratic bézier segment to y = x^2 parabola.
         let from = curve.points[0];
         let ctrl = curve.points[1];

crates/epaint/src/text/fonts.rs

@@ -1165,6 +1165,7 @@ mod tests {
         ]
     }
 
+    #[expect(clippy::print_stdout)]
     #[test]
     fn test_split_paragraphs() {
         for pixels_per_point in [1.0, 2.0_f32.sqrt(), 2.0] {

crates/epaint/src/text/text_layout.rs

@@ -554,6 +554,8 @@ fn halign_and_justify_row(
     wrap_width: f32,
     justify: bool,
 ) {
+    #![expect(clippy::useless_let_if_seq)] // False positive
+
     let row = Arc::make_mut(&mut placed_row.row);
 
     if row.glyphs.is_empty() {

examples/custom_keypad/src/keypad.rs

@@ -179,8 +179,8 @@ impl Keypad {
             )
         });
 
-        let mut is_first_show = false;
-        if ctx.wants_keyboard_input() && state.focus != focus {
+        let is_first_show = ctx.wants_keyboard_input() && state.focus != focus;
+        if is_first_show {
             let y = ctx.style().spacing.interact_size.y * 1.25;
             state.open = true;
             state.start_pos = ctx.input(|i| {
@@ -189,7 +189,6 @@ impl Keypad {
                     .map_or(pos2(100.0, 100.0), |p| p + vec2(0.0, y))
             });
             state.focus = focus;
-            is_first_show = true;
         }
 
         if state.close_on_next_frame {

examples/external_eventloop_async/src/main.rs

@@ -11,5 +11,6 @@ fn main() -> std::io::Result<()> {
 // Do not check `app` on unsupported platforms when check "--all-features" is used in CI.
 #[cfg(not(target_os = "linux"))]
 fn main() {
+    #![expect(clippy::print_stdout)]
     println!("This example only supports Linux.");
 }