Fix selection matching against folded buffers

crates/editor/src/element.rs

@@ -6171,7 +6171,7 @@ impl Element for EditorElement {
                         Vec<Selection<Point>>,
                         Vec<BufferId>,
                     ) = self.editor.update(cx, |editor, cx| {
-                        let all_selections = editor.selections.all::<usize>(cx);
+                        let all_selections = editor.selections.all::<Point>(cx);
                         let selected_buffer_ids = if editor.is_singleton(cx) {
                             Vec::new()
                         } else {
@@ -6180,7 +6180,7 @@ impl Element for EditorElement {
                             for selection in all_selections {
                                 for buffer_id in snapshot
                                     .buffer_snapshot
-                                    .buffer_ids_for_range(selection.range())
+                                    .buffer_ids_in_selected_rows(selection)
                                 {
                                     if selected_buffer_ids.last() != Some(&buffer_id) {
                                         selected_buffer_ids.push(buffer_id);

crates/multi_buffer/src/multi_buffer.rs

@@ -3449,19 +3449,17 @@ impl MultiBufferSnapshot {
         }
     }
 
-    pub fn buffer_ids_for_range<T: ToOffset>(
+    pub fn buffer_ids_in_selected_rows(
         &self,
-        range: Range<T>,
+        selection: Selection<Point>,
     ) -> impl Iterator<Item = BufferId> + '_ {
-        let range = range.start.to_offset(self)..range.end.to_offset(self);
-
-        let mut cursor = self.excerpts.cursor::<(usize, Point)>(&());
-        cursor.seek(&range.start, Bias::Left, &());
+        let mut cursor = self.excerpts.cursor::<Point>(&());
+        cursor.seek(&Point::new(selection.start.row, 0), Bias::Right, &());
         cursor.prev(&());
 
         iter::from_fn(move || {
             cursor.next(&());
-            if cursor.start().0 < range.end {
+            if cursor.start().row <= selection.end.row {
                 cursor.item().map(|item| item.buffer_id)
             } else {
                 None