Use distinct carets for line number hovers (#22836)

Release Notes:

- N/A

crates/editor/src/element.rs

@@ -3958,9 +3958,15 @@ impl EditorElement {
             let Some(()) = line.paint(hitbox.origin, line_height, cx).log_err() else {
                 continue;
             };
+            // In singleton buffers, we select corresponding lines on the line number click, so use | -like cursor.
+            // In multi buffers, we open file at the line number clicked, so use a pointing hand cursor.
+            if is_singleton {
+                cx.set_cursor_style(CursorStyle::IBeam, hitbox);
+            } else {
                 cx.set_cursor_style(CursorStyle::PointingHand, hitbox);
             }
         }
+    }
 
     fn paint_diff_hunks(layout: &mut EditorLayout, cx: &mut WindowContext) {
         if layout.display_hunks.is_empty() {