Fix further clippy lints

... and explicitly annotate crates as well.

native/src/debug/null.rs

@@ -1,5 +1,5 @@
 #![allow(missing_docs)]
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct Debug;
 
 impl Debug {

native/src/lib.rs

@@ -31,11 +31,19 @@
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/iced-rs/iced/9ab6923e943f784985e9ef9ca28b10278297225d/docs/logo.svg"
 )]
-#![deny(missing_docs)]
-#![deny(missing_debug_implementations)]
-#![deny(unused_results)]
-#![forbid(unsafe_code)]
-#![forbid(rust_2018_idioms)]
+#![deny(
+    missing_debug_implementations,
+    missing_docs,
+    unused_results,
+    clippy::extra_unused_lifetimes,
+    clippy::from_over_into,
+    clippy::needless_borrow,
+    clippy::new_without_default,
+    clippy::useless_conversion
+)]
+#![forbid(unsafe_code, rust_2018_idioms)]
+#![allow(clippy::inherent_to_string, clippy::type_complexity)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 pub mod clipboard;
 pub mod command;
 pub mod event;

native/src/overlay/menu.rs

@@ -489,15 +489,15 @@ where
     }
 }
 
-impl<'a, T, Message, Renderer> Into<Element<'a, Message, Renderer>>
-    for List<'a, T, Renderer>
+impl<'a, T, Message, Renderer> From<List<'a, T, Renderer>>
+    for Element<'a, Message, Renderer>
 where
     T: ToString + Clone,
     Message: 'a,
     Renderer: 'a + text::Renderer,
     Renderer::Theme: StyleSheet,
 {
-    fn into(self) -> Element<'a, Message, Renderer> {
-        Element::new(self)
+    fn from(list: List<'a, T, Renderer>) -> Self {
+        Element::new(list)
     }
 }

native/src/renderer/null.rs

@@ -5,7 +5,7 @@ use crate::{Background, Font, Point, Rectangle, Size, Theme, Vector};
 /// A renderer that does nothing.
 ///
 /// It can be useful if you are writing tests!
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Default)]
 pub struct Null;
 
 impl Null {

native/src/widget/button.rs

@@ -382,7 +382,7 @@ where
             self.on_press.is_some(),
             theme,
             self.style,
-            || &self.state,
+            || self.state,
         );
 
         self.content.draw(

native/src/widget/column.rs

@@ -102,6 +102,12 @@ impl<'a, Message, Renderer> Column<'a, Message, Renderer> {
     }
 }
 
+impl<'a, Message, Renderer> Default for Column<'a, Message, Renderer> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl<'a, Message, Renderer> Widget<Message, Renderer>
     for Column<'a, Message, Renderer>
 where

native/src/widget/pick_list.rs

@@ -525,7 +525,7 @@ where
     ) -> Option<overlay::Element<'_, Message, Renderer>> {
         overlay(
             layout,
-            &mut self.state,
+            self.state,
             self.padding,
             self.text_size,
             self.font.clone(),
@@ -535,8 +535,8 @@ where
     }
 }
 
-impl<'a, T: 'a, Message, Renderer> Into<Element<'a, Message, Renderer>>
-    for PickList<'a, T, Message, Renderer>
+impl<'a, T: 'a, Message, Renderer> From<PickList<'a, T, Message, Renderer>>
+    for Element<'a, Message, Renderer>
 where
     T: Clone + ToString + Eq,
     [T]: ToOwned<Owned = Vec<T>>,
@@ -549,7 +549,7 @@ where
     <Renderer::Theme as StyleSheet>::Style:
         Into<<Renderer::Theme as menu::StyleSheet>::Style>,
 {
-    fn into(self) -> Element<'a, Message, Renderer> {
-        Element::new(self)
+    fn from(pick_list: PickList<'a, T, Message, Renderer>) -> Self {
+        Element::new(pick_list)
     }
 }

native/src/widget/progress_bar.rs

@@ -76,7 +76,7 @@ where
     }
 }
 
-impl<'a, Message, Renderer> Widget<Message, Renderer> for ProgressBar<Renderer>
+impl<Message, Renderer> Widget<Message, Renderer> for ProgressBar<Renderer>
 where
     Renderer: crate::Renderer,
     Renderer::Theme: StyleSheet,

native/src/widget/row.rs

@@ -102,6 +102,12 @@ impl<'a, Message, Renderer> Row<'a, Message, Renderer> {
     }
 }
 
+impl<'a, Message, Renderer> Default for Row<'a, Message, Renderer> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl<'a, Message, Renderer> Widget<Message, Renderer>
     for Row<'a, Message, Renderer>
 where

native/src/widget/scrollable.rs

@@ -662,7 +662,7 @@ where
         shell: &mut Shell<'_, Message>,
     ) -> event::Status {
         update(
-            &mut self.state,
+            self.state,
             event,
             layout,
             cursor_position,
@@ -693,7 +693,7 @@ where
         renderer: &Renderer,
     ) -> mouse::Interaction {
         mouse_interaction(
-            &self.state,
+            self.state,
             layout,
             cursor_position,
             self.scrollbar_width,
@@ -720,7 +720,7 @@ where
         _viewport: &Rectangle,
     ) {
         draw(
-            &self.state,
+            self.state,
             renderer,
             theme,
             layout,

native/src/widget/slider.rs

@@ -410,7 +410,7 @@ where
             layout,
             cursor_position,
             shell,
-            &mut self.state,
+            self.state,
             &mut self.value,
             &self.range,
             self.step,
@@ -432,7 +432,7 @@ where
             renderer,
             layout,
             cursor_position,
-            &self.state,
+            self.state,
             self.value,
             &self.range,
             theme,

native/src/widget/text_input.rs

@@ -176,7 +176,7 @@ where
             theme,
             layout,
             cursor_position,
-            &self.state,
+            self.state,
             value.unwrap_or(&self.value),
             &self.placeholder,
             self.size,