### Godot version

v4.0.beta10.official [d0398f62f]

### System information

Windows 10, Vulkan

### Issue description

When I was testing my `debug_draw_3d` extension, I noticed that the graph titles change their size strangely.
For example, here, with a font size of 41 for one of the titles, instead of `fps5` it draws `fps6` with a font size of 14.
But the ascent of the font is taken correctly, which is why the title goes down a lot.
![godot windows editor dev x86_64_u0CvcAfqjh](https://user-images.githubusercontent.com/7782218/209420557-17f32fcc-c64c-44ff-9f08-4a11119d4ac8.gif)

I found that these hashing functions create the same hash for `fps5: 41`, `fps6: 14` and `fps8: 76`.
https://github.com/godotengine/godot/blob/f7cf9fb148140b86ee5795110373a0d55ff32860/scene/resources/font.cpp#L273-L291
https://github.com/godotengine/godot/blob/f7cf9fb148140b86ee5795110373a0d55ff32860/scene/resources/font.cpp#L303-L323
(also both of these parts of the code are repeated 3 times)

Here's what I get in MRP:
![image](https://user-images.githubusercontent.com/7782218/209420974-0cbcbb95-81a9-42e9-a9af-4b71b8715769.png)

Expected something like this:
![image](https://user-images.githubusercontent.com/7782218/209421473-4a019989-f432-40c0-b9af-c40ec969ade8.png)

Affected `Font` methods: `get_string_size`, `get_multiline_string_size`, `draw_string`, `draw_multiline_string`, `draw_string_outline`, `draw_multiline_string_outline`.

### Steps to reproduce

* Open MRP
* Notice the gray rectangles and the text somewhere near them (the text should be on top of the rectangles)
* Move the slider for the `second_font_size` parameter and watch glitches on some values.

Also, if you cache a lot of variants for `second_font_size`, and then change `first_font_size`(or vice versa), then there will be a more glitches:
![Godot_v4 0-beta10_win64_r0jJoStkQd](https://user-images.githubusercontent.com/7782218/209422373-c4ca1238-b351-4cbc-b451-136bbdb4fee0.gif)


### Minimal reproduction project

[Font Bad Hash.zip](https://github.com/godotengine/godot/files/10298021/Font.Bad.Hash.zip)

lines_buffer->set_orientation(p_orientation);
		lines_buffer->add_string(p_text, Ref<Font>(this), p_font_size);
		lines_buffer->set_width(p_width);
		lines_buffer->set_break_flags(p_brk_flags);
		lines_buffer->set_justification_flags(p_jst_flags);
		cache_wrap.insert(hash, lines_buffer);
	}
	Vector2 ofs = p_pos;
	if (p_orientation == TextServer::ORIENTATION_HORIZONTAL) {
		ofs.y -= lines_buffer->get_line_ascent(0);
	} else {
		ofs.x -= lines_buffer->get_line_ascent(0);
	}
	lines_buffer->set_alignment(p_alignment);
	lines_buffer->set_max_lines_visible(p_max_lines);
	lines_buffer->draw_outline(p_canvas_item, ofs, p_size, p_modulate);
}
Size2 Font::get_char_size(char32_t p_char, int p_font_size) const {
	if (dirty_rids) {
		_update_rids();
	}
	for (int i = 0; i < rids.size(); i++) {
		if (TS->font_has_char(rids[i], p_char)) {
			int32_t glyph = TS->font_get_glyph_index(rids[i], p_font_size, p_char, 0);
			return Size2(TS->font_get_glyph_advance(rids[i], p_font_size, glyph).x, get_height(p_font_size));
		}
	}
	return Size2();
}
real_t Font::draw_char(RID p_canvas_item, const Point2 &p_pos, char32_t p_char, int p_font_size, const Color &p_modulate) const {