Kerning Pairs property for Monospace Image Font Data does not support spaces

[DarkMarmot]

Tested versions

• Reproducible in: Godot v4.3.beta1.official [a4f2ea9]

System information

Godot v4.3.beta1 - Windows 10.0.22631 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3050 (NVIDIA; 31.0.15.5176) - AMD Ryzen 7 2700 Eight-Core Processor (16 Threads)

Issue description

When creating monospace image fonts, the new kerning_pairs property allows character combo kerning settings to be applied, which is awesome. From the tooltip, though, these settings are made using two strings and an integer with [space] as the delimiter.

This seems to preclude the use of kerning settings for the [space] character itself, which causes problems with text layout (large gaps in my case).

The current "latest" docs do not seem to have information, so it's very possible I am missing something in the intended usage.

As an aside, a way to define a wildcard so that a character has the same kerning for all subsequent characters would be handy.

Image of the settings window for quick reference.

Steps to reproduce

1. Import a text PNG as monospace font data as seen with example here: https://docs.godotengine.org/en/latest/tutorials/ui/gui_using_fonts.html#doc-gui-using-fonts
2. Add a label node to a scene and set the font data in its LabelSettings.
3. Add text and try to modify the kerning of the [space] character in the scene.

Minimal reproduction project (MRP)

kerning_issue.zip