### 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)

ERR_FAIL_COND_V(p_cache_index < 0, 0);
	_ensure_rid(p_cache_index);
	return TS->font_get_glyph_texture_idx(cache[p_cache_index], p_size, p_glyph);
}
TypedArray<Vector2i> FontFile::get_kerning_list(int p_cache_index, int p_size) const {
	ERR_FAIL_COND_V(p_cache_index < 0, Array());
	_ensure_rid(p_cache_index);
	return TS->font_get_kerning_list(cache[p_cache_index], p_size);
}
void FontFile::clear_kerning_map(int p_cache_index, int p_size) {
	ERR_FAIL_COND(p_cache_index < 0);
	_ensure_rid(p_cache_index);
	TS->font_clear_kerning_map(cache[p_cache_index], p_size);
}
void FontFile::remove_kerning(int p_cache_index, int p_size, const Vector2i &p_glyph_pair) {
	ERR_FAIL_COND(p_cache_index < 0);
	_ensure_rid(p_cache_index);
	TS->font_remove_kerning(cache[p_cache_index], p_size, p_glyph_pair);
}
void FontFile::set_kerning(int p_cache_index, int p_size, const Vector2i &p_glyph_pair, const Vector2 &p_kerning) {
	ERR_FAIL_COND(p_cache_index < 0);
	_ensure_rid(p_cache_index);
	TS->font_set_kerning(cache[p_cache_index], p_size, p_glyph_pair, p_kerning);
}
Vector2 FontFile::get_kerning(int p_cache_index, int p_size, const Vector2i &p_glyph_pair) const {
	ERR_FAIL_COND_V(p_cache_index < 0, Vector2());
	_ensure_rid(p_cache_index);
	return TS->font_get_kerning(cache[p_cache_index], p_size, p_glyph_pair);
}
void FontFile::render_range(int p_cache_index, const Vector2i &p_size, char32_t p_start, char32_t p_end) {