Replace map + unwrap_or(true) with is_none_or (#17070)

# Objective

Reduce all varieties of `my_maybe.map(|x| x.is_true).unwrap_or(true)`
using `is_none_or`.

crates/bevy_ecs/src/removal_detection.rs

@@ -233,8 +233,7 @@ impl<'w, 's, T: Component> RemovedComponents<'w, 's, T> {
     /// Returns `true` if there are no events available to read.
     pub fn is_empty(&self) -> bool {
         self.events()
-            .map(|events| self.reader.is_empty(events))
-            .unwrap_or(true)
+            .is_none_or(|events| self.reader.is_empty(events))
     }
 
     /// Consumes all available events.

crates/bevy_hierarchy/src/query_extension.rs

@@ -139,10 +139,10 @@ impl<'w, 's, D: QueryData, F: QueryFilter> HierarchyQueryExt<'w, 's, D, F> for Q
     {
         self.iter_descendants_depth_first(entity).filter(|entity| {
             self.get(*entity)
+                .ok()
                 // These are leaf nodes if they have the `Children` component but it's empty
-                .map(|children| children.is_empty())
                 // Or if they don't have the `Children` component at all
-                .unwrap_or(true)
+                .is_none_or(|children| children.is_empty())
         })
     }
 

crates/bevy_picking/src/mesh_picking/mod.rs

@@ -99,10 +99,7 @@ pub fn update_hits(
                 let entity_layers = layers.get(entity).cloned().unwrap_or_default();
                 let render_layers_match = cam_layers.intersects(&entity_layers);
 
-                let is_pickable = pickables
-                    .get(entity)
-                    .map(|p| p.is_hoverable)
-                    .unwrap_or(true);
+                let is_pickable = pickables.get(entity).ok().is_none_or(|p| p.is_hoverable);
 
                 marker_requirement && render_layers_match && is_pickable
             },

crates/bevy_reflect/derive/src/container_attributes.rs

@@ -89,10 +89,7 @@ pub(crate) struct FromReflectAttrs {
 impl FromReflectAttrs {
     /// Returns true if `FromReflect` should be automatically derived as part of the `Reflect` derive.
     pub fn should_auto_derive(&self) -> bool {
-        self.auto_derive
-            .as_ref()
-            .map(LitBool::value)
-            .unwrap_or(true)
+        self.auto_derive.as_ref().is_none_or(LitBool::value)
     }
 }
 
@@ -112,10 +109,7 @@ pub(crate) struct TypePathAttrs {
 impl TypePathAttrs {
     /// Returns true if `TypePath` should be automatically derived as part of the `Reflect` derive.
     pub fn should_auto_derive(&self) -> bool {
-        self.auto_derive
-            .as_ref()
-            .map(LitBool::value)
-            .unwrap_or(true)
+        self.auto_derive.as_ref().is_none_or(LitBool::value)
     }
 }
 

crates/bevy_scene/src/scene_spawner.rs

@@ -375,12 +375,12 @@ impl SceneSpawner {
                     // the scene parent
                     if !world
                         .get_entity(entity)
+                        .ok()
                         // This will filter only the scene root entity, as all other from the
                         // scene have a parent
-                        .map(|entity| entity.contains::<Parent>())
-                        // Default is true so that it won't run on an entity that wouldn't exist anymore
+                        // Entities that wouldn't exist anymore are also skipped
                         // this case shouldn't happen anyway
-                        .unwrap_or(true)
+                        .is_none_or(|entity| entity.contains::<Parent>())
                     {
                         world.entity_mut(parent).add_child(entity);
                     }

crates/bevy_sprite/src/picking_backend.rs

@@ -186,9 +186,7 @@ fn sprite_picking(
                 };
 
                 blocked = cursor_in_valid_pixels_of_sprite
-                    && picking_behavior
-                        .map(|p| p.should_block_lower)
-                        .unwrap_or(true);
+                    && picking_behavior.is_none_or(|p| p.should_block_lower);
 
                 cursor_in_valid_pixels_of_sprite.then(|| {
                     let hit_pos_world =

crates/bevy_ui/src/render/mod.rs

@@ -702,14 +702,9 @@ pub fn extract_text_sections(
                 rect,
             });
 
-            if text_layout_info
-                .glyphs
-                .get(i + 1)
-                .map(|info| {
-                    info.span_index != current_span || info.atlas_info.texture != atlas_info.texture
-                })
-                .unwrap_or(true)
-            {
+            if text_layout_info.glyphs.get(i + 1).is_none_or(|info| {
+                info.span_index != current_span || info.atlas_info.texture != atlas_info.texture
+            }) {
                 let id = commands.spawn(TemporaryRenderEntity).id();
 
                 extracted_uinodes.uinodes.insert(