Fix incorrect highlighting when an empty range is highlighted via the DisplayMap

Co-Authored-By: Keith Simmons <keith@zed.dev>

crates/editor/src/display_map/fold_map.rs

@@ -1156,7 +1156,7 @@ impl Ord for HighlightEndpoint {
     fn cmp(&self, other: &Self) -> Ordering {
         self.offset
             .cmp(&other.offset)
-            .then_with(|| self.is_start.cmp(&other.is_start))
+            .then_with(|| other.is_start.cmp(&self.is_start))
     }
 }