yoda: cargo fix --lib (libcosmic-yoda) — drop 99 trivial warnings

Auto-applied suggestions on libcosmic-yoda lib only: unused imports,
unused-by-name params (prefixed with _), redundant mutability. From 113
warnings down to 14 (the 14 remaining are real signals: never-read
fields, unreachable patterns, etc., to be reviewed manually).

Leyoda 2026 – GPLv3

src/widget/dropdown/menu/mod.rs

@@ -8,9 +8,8 @@ use std::sync::{Arc, Mutex};
 
 pub use appearance::{Appearance, StyleSheet};
 
-use crate::surface;
 use crate::widget::{Container, RcWrapper, icon};
-use iced_core::event::{self, Event};
+use iced_core::event::Event;
 use iced_core::layout::{self, Layout};
 use iced_core::text::{self, Text};
 use iced_core::widget::Tree;
@@ -391,7 +390,7 @@ impl<'a, Message: Clone + 'a> crate::widget::Widget<Message, crate::Theme, crate
 
     fn draw(
         &self,
-        tree: &Tree,
+        _tree: &Tree,
         renderer: &mut crate::Renderer,
         theme: &crate::Theme,
         style: &renderer::Style,
@@ -554,12 +553,12 @@ where
 
     fn draw(
         &self,
-        state: &Tree,
+        _state: &Tree,
         renderer: &mut crate::Renderer,
         theme: &crate::Theme,
-        style: &renderer::Style,
+        _style: &renderer::Style,
         layout: Layout<'_>,
-        cursor: mouse::Cursor,
+        _cursor: mouse::Cursor,
         viewport: &Rectangle,
     ) {
         let appearance = theme.appearance(&());

src/widget/dropdown/multi/menu.rs

@@ -2,7 +2,7 @@ use super::Model;
 pub use crate::widget::dropdown::menu::{Appearance, StyleSheet};
 
 use crate::widget::Container;
-use iced_core::event::{self, Event};
+use iced_core::event::Event;
 use iced_core::layout::{self, Layout};
 use iced_core::text::{self, Text};
 use iced_core::widget::Tree;

src/widget/dropdown/multi/widget.rs

@@ -5,7 +5,7 @@
 use super::menu::{self, Menu};
 use crate::widget::icon;
 use derive_setters::Setters;
-use iced_core::event::{self, Event};
+use iced_core::event::Event;
 use iced_core::text::{self, Paragraph, Text};
 use iced_core::widget::tree::{self, Tree};
 use iced_core::{
@@ -13,7 +13,6 @@ use iced_core::{
 };
 use iced_core::{Shadow, alignment, keyboard, layout, mouse, overlay, renderer, svg, touch};
 use iced_widget::pick_list;
-use std::ffi::OsStr;
 
 pub use iced_widget::pick_list::{Catalog, Style};
 
@@ -253,7 +252,7 @@ impl<Item: Clone + PartialEq + 'static> Default for State<Item> {
 /// Computes the layout of a [`Dropdown`].
 #[allow(clippy::too_many_arguments)]
 pub fn layout(
-    renderer: &crate::Renderer,
+    _renderer: &crate::Renderer,
     limits: &layout::Limits,
     width: Length,
     gap: f32,
@@ -376,7 +375,7 @@ pub fn mouse_interaction(layout: Layout<'_>, cursor: mouse::Cursor) -> mouse::In
 #[allow(clippy::too_many_arguments)]
 pub fn overlay<'a, S: AsRef<str>, Message: 'a, Item: Clone + PartialEq + 'static>(
     layout: Layout<'_>,
-    renderer: &crate::Renderer,
+    _renderer: &crate::Renderer,
     state: &'a mut State<Item>,
     gap: f32,
     padding: Padding,

src/widget/dropdown/operation.rs

@@ -2,9 +2,6 @@
 // SPDX-License-Identifier: MPL-2.0 AND MIT
 //! Operate on dropdown widgets.
 
-use super::State;
-use iced::Rectangle;
-use iced_core::widget::{Id, Operation};
 
 pub trait Dropdown {
     fn close(&mut self);

src/widget/dropdown/widget.rs

@@ -8,7 +8,7 @@ use crate::widget::icon::{self, Handle};
 use crate::{Element, surface};
 use derive_setters::Setters;
 use iced::window;
-use iced_core::event::{self, Event};
+use iced_core::event::Event;
 use iced_core::text::{self, Paragraph, Text};
 use iced_core::widget::tree::{self, Tree};
 use iced_core::{
@@ -17,7 +17,6 @@ use iced_core::{
 use iced_core::{Shadow, alignment, keyboard, layout, mouse, overlay, renderer, svg, touch};
 use iced_widget::pick_list::{self, Catalog};
 use std::borrow::Cow;
-use std::ffi::OsStr;
 use std::hash::{DefaultHasher, Hash, Hasher};
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, LazyLock, Mutex};
@@ -328,10 +327,10 @@ where
 
     fn operate(
         &mut self,
-        tree: &mut Tree,
+        _tree: &mut Tree,
         _layout: Layout<'_>,
         _renderer: &crate::Renderer,
-        operation: &mut dyn iced_core::widget::Operation,
+        _operation: &mut dyn iced_core::widget::Operation,
     ) {
         // TODO: double check operation handling
         // let state = tree.state.downcast_mut::<State>();
@@ -343,7 +342,7 @@ where
         tree: &'b mut Tree,
         layout: Layout<'b>,
         renderer: &crate::Renderer,
-        viewport: &Rectangle,
+        _viewport: &Rectangle,
         translation: Vector,
     ) -> Option<overlay::Element<'b, Message, crate::Theme, crate::Renderer>> {
         #[cfg(all(feature = "wayland", target_os = "linux"))]
@@ -452,7 +451,7 @@ impl super::operation::Dropdown for State {
 /// Computes the layout of a [`Dropdown`].
 #[allow(clippy::too_many_arguments)]
 pub fn layout(
-    renderer: &crate::Renderer,
+    _renderer: &crate::Renderer,
     limits: &layout::Limits,
     width: Length,
     gap: f32,
@@ -546,7 +545,7 @@ pub fn update<
     cursor: mouse::Cursor,
     shell: &mut Shell<'_, Message>,
     #[cfg(all(feature = "wayland", target_os = "linux"))]
-    positioner: iced_runtime::platform_specific::wayland::popup::SctkPositioner,
+    _positioner: iced_runtime::platform_specific::wayland::popup::SctkPositioner,
     on_selected: Arc<dyn Fn(usize) -> Message + Send + Sync + 'static>,
     selected: Option<usize>,
     selections: &[S],
@@ -558,7 +557,7 @@ pub fn update<
     gap: f32,
     padding: Padding,
     text_size: Option<f32>,
-    font: Option<crate::font::Font>,
+    _font: Option<crate::font::Font>,
     selected_option: Option<usize>,
 ) {
     let state = state();