More element arena (#11258)

Co-Authored-By: Mikayla <mikayla@zed.dev>

My Zed was running out with collab + chat + recent projects + two splits
on a large monitor


Release Notes:

- N/A

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/gpui/src/window.rs

@@ -95,7 +95,8 @@ slotmap::new_key_type! {
 }
 
 thread_local! {
-    pub(crate) static ELEMENT_ARENA: RefCell<Arena> = RefCell::new(Arena::new(8 * 1024 * 1024));
+    /// 8MB wasn't quite enough...
+    pub(crate) static ELEMENT_ARENA: RefCell<Arena> = RefCell::new(Arena::new(32 * 1024 * 1024));
 }
 
 impl FocusId {