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/debugger_ui/src/stack_trace_view.rs

@@ -59,7 +59,7 @@ impl StackTraceView {
 
                     editor
                         .snapshot(window, cx)
-                        .buffer_snapshot
+                        .buffer_snapshot()
                         .excerpt_containing(position..position)
                         .map(|excerpt| excerpt.id())
                 });
@@ -259,7 +259,7 @@ impl StackTraceView {
             let mut is_first = true;
 
             for (_, highlight) in self.highlights.iter().skip(active_idx) {
-                let position = highlight.to_point(&snapshot.buffer_snapshot);
+                let position = highlight.to_point(&snapshot.buffer_snapshot());
                 let color = if is_first {
                     is_first = false;
                     first_color
@@ -268,11 +268,11 @@ impl StackTraceView {
                 };
 
                 let start = snapshot
-                    .buffer_snapshot
+                    .buffer_snapshot()
                     .clip_point(Point::new(position.row, 0), Bias::Left);
                 let end = start + Point::new(1, 0);
-                let start = snapshot.buffer_snapshot.anchor_before(start);
-                let end = snapshot.buffer_snapshot.anchor_before(end);
+                let start = snapshot.buffer_snapshot().anchor_before(start);
+                let end = snapshot.buffer_snapshot().anchor_before(end);
                 editor.highlight_rows::<DebugStackFrameLine>(
                     start..end,
                     color,