Move self in Element::paint

Remove mutable state borrows in favor of state ownership in render processes to streamline element rendering.

crates/gpui2/src/app/entity_map.rs

@@ -1,10 +1,10 @@
-use crate::{private::Sealed, AnyBox, AppContext, Context, Entity, ModelContext};
+use crate::{private::Sealed, AppContext, Context, Entity, ModelContext};
 use anyhow::{anyhow, Result};
 use derive_more::{Deref, DerefMut};
 use parking_lot::{RwLock, RwLockUpgradableReadGuard};
 use slotmap::{SecondaryMap, SlotMap};
 use std::{
-    any::{type_name, TypeId},
+    any::{type_name, Any, TypeId},
     fmt::{self, Display},
     hash::{Hash, Hasher},
     marker::PhantomData,
@@ -31,7 +31,7 @@ impl Display for EntityId {
 }
 
 pub(crate) struct EntityMap {
-    entities: SecondaryMap<EntityId, AnyBox>,
+    entities: SecondaryMap<EntityId, Box<dyn Any>>,
     ref_counts: Arc<RwLock<EntityRefCounts>>,
 }
 
@@ -101,7 +101,7 @@ impl EntityMap {
         );
     }
 
-    pub fn take_dropped(&mut self) -> Vec<(EntityId, AnyBox)> {
+    pub fn take_dropped(&mut self) -> Vec<(EntityId, Box<dyn Any>)> {
         let mut ref_counts = self.ref_counts.write();
         let dropped_entity_ids = mem::take(&mut ref_counts.dropped_entity_ids);
 
@@ -121,7 +121,7 @@ impl EntityMap {
 }
 
 pub struct Lease<'a, T> {
-    entity: Option<AnyBox>,
+    entity: Option<Box<dyn Any>>,
     pub model: &'a Model<T>,
     entity_type: PhantomData<T>,
 }