### Godot version

v4.2.dev5.official [e3e2528ba]

### System information

Godot v4.2.dev5 - Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 970 (NVIDIA; 31.0.15.3623) - Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz (8 Threads)

### Issue description

#79975 closed his issue too early, it's a separate issue to #78434.

I'll just repost his same gif:
![256703477-a7db18c1-eccf-42af-85ef-1a1472f30c73](https://github.com/godotengine/godot/assets/15337628/1a7926ea-a9d8-4eb3-a857-8d34df23228f)

### Steps to reproduce

I had a theory it was related to editor settings and I tracked it down:

1. Editor -> `Display Scale` = Custom
2. Editor -> `Custom Display Scale` = 1.15
3. Click Save & Restart
4. Print stuff

```
var number := 0
func _process(delta: float) -> void:
	number += 1
	print(number)
```

The scale number matters, 1.1 seems to be fine but smaller decimal places such as 1.15 are what cause the issue.

### Minimal reproduction project

[printbug.zip](https://github.com/godotengine/godot/files/12683758/printbug.zip)

Rect2 rect = Rect2(sel[i].x + p_ofs.x + off.x, p_ofs.y + off.y - TS->shaped_text_get_ascent(rid), sel[i].y - sel[i].x, TS->shaped_text_get_size(rid).y);
				RenderingServer::get_singleton()->canvas_item_add_rect(ci, rect, selection_bg);
			}
		}
		Vector2 ul_start;
		bool ul_started = false;
		Color ul_color_prev;
		Color ul_color;
		Vector2 dot_ul_start;
		bool dot_ul_started = false;
		Color dot_ul_color_prev;
		Color dot_ul_color;
		Vector2 st_start;
		bool st_started = false;
		Color st_color_prev;
		Color st_color;
		for (int i = 0; i < gl_size; i++) {
			bool selected = selection.active && (sel_start != -1) && (glyphs[i].start >= sel_start) && (glyphs[i].end <= sel_end);
			Item *it = _get_item_at_pos(it_from, it_to, glyphs[i].start);
			Color font_color = _find_color(it, p_base_color);
			if (_find_underline(it) || (_find_meta(it, nullptr) && underline_meta)) {
				if (ul_started && font_color != ul_color_prev) {
					float y_off = TS->shaped_text_get_underline_position(rid);
					float underline_width = MAX(1.0, TS->shaped_text_get_underline_thickness(rid) * theme_cache.base_scale);
					draw_line(ul_start + Vector2(0, y_off), p_ofs + Vector2(off.x, off.y + y_off), ul_color, underline_width);
					ul_start = p_ofs + Vector2(off.x, off.y);
					ul_color_prev = font_color;
					ul_color = font_color;
					ul_color.a *= 0.5;
				} else if (!ul_started) {