Move self in Element::paint

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

crates/gpui2/src/window.rs

@@ -1,5 +1,5 @@
 use crate::{
-    key_dispatch::DispatchActionListener, px, size, Action, AnyBox, AnyDrag, AnyView, AppContext,
+    key_dispatch::DispatchActionListener, px, size, Action, AnyDrag, AnyView, AppContext,
     AsyncWindowContext, AvailableSpace, Bounds, BoxShadow, Context, Corners, CursorStyle,
     DevicePixels, DispatchNodeId, DispatchTree, DisplayId, Edges, Effect, Entity, EntityId,
     EventEmitter, FileDropEvent, FocusEvent, FontId, GlobalElementId, GlyphId, Hsla, ImageData,
@@ -237,7 +237,7 @@ pub struct Window {
 
 // #[derive(Default)]
 pub(crate) struct Frame {
-    pub(crate) element_states: HashMap<GlobalElementId, AnyBox>,
+    pub(crate) element_states: HashMap<GlobalElementId, Box<dyn Any>>,
     mouse_listeners: HashMap<TypeId, Vec<(StackingOrder, AnyMouseListener)>>,
     pub(crate) dispatch_tree: DispatchTree,
     pub(crate) focus_listeners: Vec<AnyFocusListener>,