Fix some minor clippy lints from the future

crates/egui/src/layout.rs

@@ -765,7 +765,7 @@ impl Layout {
 
     /// Move to the next row in a wrapping layout.
     /// Otherwise does nothing.
-    pub(crate) fn end_row(&mut self, region: &mut Region, spacing: Vec2) {
+    pub(crate) fn end_row(&self, region: &mut Region, spacing: Vec2) {
         if self.main_wrap {
             match self.main_dir {
                 Direction::LeftToRight => {
@@ -788,7 +788,7 @@ impl Layout {
     }
 
     /// Set row height in horizontal wrapping layout.
-    pub(crate) fn set_row_height(&mut self, region: &mut Region, height: f32) {
+    pub(crate) fn set_row_height(&self, region: &mut Region, height: f32) {
         if self.main_wrap && self.is_horizontal() {
             region.cursor.max.y = region.cursor.min.y + height;
         }

crates/egui/src/menu.rs

@@ -349,7 +349,7 @@ impl MenuRoot {
     }
 
     pub fn show<R>(
-        &mut self,
+        &self,
         button: &Response,
         add_contents: impl FnOnce(&mut Ui) -> R,
     ) -> (MenuResponse, Option<InnerResponse<R>>) {
@@ -759,7 +759,7 @@ impl MenuState {
         self.sub_menu.as_ref().map(|(_, sub)| sub)
     }
 
-    fn submenu(&mut self, id: Id) -> Option<&Arc<RwLock<Self>>> {
+    fn submenu(&self, id: Id) -> Option<&Arc<RwLock<Self>>> {
         self.sub_menu
             .as_ref()
             .and_then(|(k, sub)| if id == *k { Some(sub) } else { None })

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

@@ -98,7 +98,7 @@ impl TextEditState {
     }
 
     #[deprecated = "Use `self.cursor.range` instead"]
-    pub fn cursor_range(&mut self, galley: &Galley) -> Option<CursorRange> {
+    pub fn cursor_range(&self, galley: &Galley) -> Option<CursorRange> {
         self.cursor.range(galley)
     }
 }