editor: Shrink DisplayMapSnapshot from 824 to 256 bytes (#39568)

We have unnecessary clones for the fields here as most of the snapshots
contain the others hierarchically.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

crates/editor/src/display_map/block_map.rs

@@ -33,8 +33,8 @@ const BULLETS: &[u8; u128::BITS as usize] = &[b'*'; _];
 ///
 /// See the [`display_map` module documentation](crate::display_map) for more information.
 pub struct BlockMap {
+    pub(super) wrap_snapshot: RefCell<WrapSnapshot>,
     next_block_id: AtomicUsize,
-    wrap_snapshot: RefCell<WrapSnapshot>,
     custom_blocks: Vec<Arc<CustomBlock>>,
     custom_blocks_by_id: TreeMap<CustomBlockId, Arc<CustomBlock>>,
     transforms: RefCell<SumTree<Transform>>,
@@ -53,7 +53,7 @@ pub struct BlockMapWriter<'a>(&'a mut BlockMap);
 
 #[derive(Clone)]
 pub struct BlockSnapshot {
-    wrap_snapshot: WrapSnapshot,
+    pub(super) wrap_snapshot: WrapSnapshot,
     transforms: SumTree<Transform>,
     custom_blocks_by_id: TreeMap<CustomBlockId, Arc<CustomBlock>>,
     pub(super) buffer_header_height: u32,

crates/editor/src/display_map/fold_map.rs

@@ -624,10 +624,10 @@ impl FoldMap {
 
 #[derive(Clone)]
 pub struct FoldSnapshot {
+    pub inlay_snapshot: InlaySnapshot,
     transforms: SumTree<Transform>,
     folds: SumTree<Fold>,
     fold_metadata_by_id: TreeMap<FoldId, FoldMetadata>,
-    pub inlay_snapshot: InlaySnapshot,
     pub version: usize,
 }
 

crates/editor/src/display_map/wrap_map.rs

@@ -30,7 +30,7 @@ pub struct WrapMap {
 
 #[derive(Clone)]
 pub struct WrapSnapshot {
-    tab_snapshot: TabSnapshot,
+    pub(super) tab_snapshot: TabSnapshot,
     transforms: SumTree<Transform>,
     interpolated: bool,
 }