### 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
const int max_sc_width = String::num(max_sc).length() * max_digit_width;
			while (!step_found) {
				int min = max_sc_width;
				if (decimals > 0) {
					min += period_width + max_digit_width * decimals;
				}
				static const int _multp[3] = { 1, 2, 5 };
				for (int i = 0; i < 3; i++) {
					step = (_multp[i] * dec);
					if (step * scale / SC_ADJ > min) {
						step_found = true;
						break;
					}
				}
				if (step_found) {
					break;
				}
				dec *= 10;
				decimals--;
				if (decimals < 0) {
					decimals = 0;
				}
			}
			if (use_fps) {
				float step_size = animation->get_step();
				if (step_size > 0) {
					int prev_frame_ofs = -10000000;
					for (int i = 0; i < zoomw; i++) {
						float pos = get_value() + double(i) / scale;
						float prev = get_value() + (double(i) - 1.0) / scale;