### 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)

virtual void set_embolden(int p_cache_index, float p_strength);
	virtual float get_embolden(int p_cache_index) const;
	virtual void set_transform(int p_cache_index, Transform2D p_transform);
	virtual Transform2D get_transform(int p_cache_index) const;
	virtual void set_face_index(int p_cache_index, int64_t p_index);
	virtual int64_t get_face_index(int p_cache_index) const;
	virtual void set_cache_ascent(int p_cache_index, int p_size, real_t p_ascent);
	virtual real_t get_cache_ascent(int p_cache_index, int p_size) const;
	virtual void set_cache_descent(int p_cache_index, int p_size, real_t p_descent);
	virtual real_t get_cache_descent(int p_cache_index, int p_size) const;
	virtual void set_cache_underline_position(int p_cache_index, int p_size, real_t p_underline_position);
	virtual real_t get_cache_underline_position(int p_cache_index, int p_size) const;
	virtual void set_cache_underline_thickness(int p_cache_index, int p_size, real_t p_underline_thickness);
	virtual real_t get_cache_underline_thickness(int p_cache_index, int p_size) const;
	virtual void set_cache_scale(int p_cache_index, int p_size, real_t p_scale); 
	virtual real_t get_cache_scale(int p_cache_index, int p_size) const;
	virtual int get_texture_count(int p_cache_index, const Vector2i &p_size) const;
	virtual void clear_textures(int p_cache_index, const Vector2i &p_size);
	virtual void remove_texture(int p_cache_index, const Vector2i &p_size, int p_texture_index);
	virtual void set_texture_image(int p_cache_index, const Vector2i &p_size, int p_texture_index, const Ref<Image> &p_image);
	virtual Ref<Image> get_texture_image(int p_cache_index, const Vector2i &p_size, int p_texture_index) const;
	virtual void set_texture_offsets(int p_cache_index, const Vector2i &p_size, int p_texture_index, const PackedInt32Array &p_offset);
	virtual PackedInt32Array get_texture_offsets(int p_cache_index, const Vector2i &p_size, int p_texture_index) const;
	virtual PackedInt32Array get_glyph_list(int p_cache_index, const Vector2i &p_size) const;
	virtual void clear_glyphs(int p_cache_index, const Vector2i &p_size);
	virtual void remove_glyph(int p_cache_index, const Vector2i &p_size, int32_t p_glyph);
	virtual void set_glyph_advance(int p_cache_index, int p_size, int32_t p_glyph, const Vector2 &p_advance);
	virtual Vector2 get_glyph_advance(int p_cache_index, int p_size, int32_t p_glyph) const;
	virtual void set_glyph_offset(int p_cache_index, const Vector2i &p_size, int32_t p_glyph, const Vector2 &p_offset);
	virtual Vector2 get_glyph_offset(int p_cache_index, const Vector2i &p_size, int32_t p_glyph) const;