Allow defining custom icons for exported categories in the Inspector

[xxSeys1]

Describe the project you are working on

I'm building a lot of custom scenes that I then only have to instance and configure a bit to speed up my game development. For the customization I'm using the [at]export keyword.

Describe the problem or limitation you are having in your project

There are non, maybe that the Inspector gets a bit cluttered when there are many exported variables, but custom icons would really only be a cosmetic thing.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

In the case that the Inspector becomes to cluttered custom icons could help keeping it organized.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

Maybe add an option to specify a path to an item after the [at]export_category keyword (for example [at]export_category("name", "path_to_icon") ) .

If this enhancement will not be used often, can it be worked around with a few lines of script?

It can be worked around by using category names like "zoom" or "debug", for which icons already exist. This is probably because there are categories with these names somewhere in some nodes.

Is there a reason why this should be core and not an add-on in the asset library?

It's an editor feature

[YuriSizov]

It can be worked around by using category names like "zoom" or "debug", for which icons already exist. This is probably because there are categories with these names somewhere in some nodes.

Don't tell anyone I told you that, but you can actually do it for custom categories as well.

The icons are displayed for any globally registered class, so all you need is a dummy exposed class, like

extends Object
class_name Customization, "res://assets/editor/configuration.png"

This works in 3.x, should still work in 4.x.

[dalexeev]

In 4.x the hack no longer works, as the inspector distinguishes custom categories from standard categories by hint_string and does not display icons for custom categories at all. See godotengine/godot#81221 for details.

You can use the hack by setting a hint_string in _get_property_list() or @export_custom, but this is a bad idea as it will break the documentation tooltips.

We could add support for custom icons using a special prefix in hint_string that the Inspector would recognize. For example, icon:res://icon.svg. Let me know if you are interested in this.