### 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
add_track->get_popup()->add_icon_item(get_editor_theme_icon(SNAME("KeyCall")), TTR("Call Method Track"));
			add_track->get_popup()->add_icon_item(get_editor_theme_icon(SNAME("KeyBezier")), TTR("Bezier Curve Track"));
			add_track->get_popup()->add_icon_item(get_editor_theme_icon(SNAME("KeyAudio")), TTR("Audio Playback Track"));
			add_track->get_popup()->add_icon_item(get_editor_theme_icon(SNAME("KeyAnimation")), TTR("Animation Playback Track"));
		} break;
		case EditorSettings::NOTIFICATION_EDITOR_SETTINGS_CHANGED: {
			panner->setup((ViewPanner::ControlScheme)EDITOR_GET("editors/panning/animation_editors_panning_scheme").operator int(), ED_GET_SHORTCUT("canvas_item_editor/pan_view"), bool(EDITOR_GET("editors/panning/simple_panning")));
		} break;
		case NOTIFICATION_RESIZED: {
			len_hb->set_position(Vector2(get_size().width - get_buttons_width(), 0));
			len_hb->set_size(Size2(get_buttons_width(), get_size().height));
		} break;
		case NOTIFICATION_DRAW: {
			int key_range = get_size().width - get_buttons_width() - get_name_limit();
			if (!animation.is_valid()) {
				return;
			}
			Ref<Font> font = get_theme_font(SNAME("font"), SNAME("Label"));
			int font_size = get_theme_font_size(SNAME("font_size"), SNAME("Label"));
			Color color = get_theme_color(SNAME("font_color"), SNAME("Label"));
			int zoomw = key_range;
			float scale = get_zoom_scale();
			int h = get_size().height;
			float l = animation->get_length();
			if (l <= 0) {
				l = 0.0001; 
			}
			Ref<Texture2D> hsize_icon = get_editor_theme_icon(SNAME("Hsize"));
			hsize_rect = Rect2(get_name_limit() - hsize_icon->get_width() - 2 * EDSCALE, (get_size().height - hsize_icon->get_height()) / 2, hsize_icon->get_width(), hsize_icon->get_height());
			draw_texture(hsize_icon, hsize_rect.position);