Use proper, limited excerpt ranges and manage inlay cache properly

crates/editor/src/display_map.rs

@@ -249,6 +249,10 @@ impl DisplayMap {
         to_insert: Vec<(InlayId, InlayProperties<T>)>,
         cx: &mut ModelContext<Self>,
     ) {
+        if to_remove.is_empty() && to_insert.is_empty() {
+            return;
+        }
+
         let buffer_snapshot = self.buffer.read(cx).snapshot(cx);
         let edits = self.buffer_subscription.consume().into_inner();
         let (snapshot, edits) = self.inlay_map.sync(buffer_snapshot, edits);