### Godot version

4.2 dev3

### System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

### Issue description

If you have a Method Track with multiple calls to the same method, they are joined together and makes things unreadable:
![image](https://github.com/godotengine/godot/assets/2223172/a2ab8446-28a1-440b-b0d5-5049f5d705b4)
The horizontal line shouldn't be used here. I think it might be a regression.

### Steps to reproduce

1. Add AnimationPlayer
2. Add a Method Track (with Add Track button)
3. Add some key to the track
4. Add another key with the same method

### Minimal reproduction project

N/A
if (mb->is_command_or_control_pressed() || mb->is_shift_pressed()) {
						if (editor->is_key_selected(track, key_idx)) {
							emit_signal(SNAME("deselect_key"), key_idx);
						} else {
							emit_signal(SNAME("select_key"), key_idx, false);
							moving_selection_attempt = true;
							select_single_attempt = -1;
							moving_selection_from_ofs = (mb->get_position().x - limit) / timeline->get_zoom_scale();
						}
					} else {
						if (!editor->is_key_selected(track, key_idx)) {
							emit_signal(SNAME("select_key"), key_idx, true);
							select_single_attempt = -1;
						} else {
							select_single_attempt = key_idx;
						}
						moving_selection_attempt = true;
						moving_selection_from_ofs = (mb->get_position().x - limit) / timeline->get_zoom_scale();
					}
					if (read_only) {
						moving_selection_attempt = false;
						moving_selection_from_ofs = 0.0f;
					}
					accept_event();
				}
			}
		}
	}
	if (mb.is_valid() && mb->is_pressed() && mb->get_button_index() == MouseButton::RIGHT) {
		Point2 pos = mb->get_position();