### Godot version

4.0.rc6

### System information

Windows 10

### Issue description

Disabled items of an `ItemList` still trigger `item_selected` and `item_activated` signals when using the mouse. Even though the documentation states that:
> Disabled items cannot be selected and do not trigger activation signals (when double-clicking or pressing Enter).

Visually, they are as expected (grayed out and can't grab focus).

-----
This seems to be a recurring problem as it has happened in Godot 2 (#5683) and Godot 3 (#37277) as well.
According to the comments in #37277, PR #37285 (#60123) is supposed to fix it for Godot 4. But it still seems to be an issue.

The PR suggests using `disabled` for rendering and `selectable` for actual selection. If that's the final verdict on the matter, then the documentation should be updated to reflect this.

### Steps to reproduce

1. Create a simple scene.
2. Add an `ItemList` and add several items to it via the Inspector. Disable one or more items.
3. Attach a script to the item list with the following code:
```gdscript
extends ItemList


func _ready() -> void:
	item_activated.connect(_on_item_activated)
	item_selected.connect(_on_item_selected)


func _on_item_activated(item_index: int) -> void:
	prints("Item Activated:", item_index)


func _on_item_selected(item_index: int) -> void:
	prints("Item Selected:", item_index)
```
4. Run the project and try selecting/activating a disabled item.
5. Check the Output console for results.

### Minimal reproduction project

[ItemList_DisabledItem_Bug.zip](https://github.com/godotengine/godot/files/10844570/ItemList_DisabledItem_Bug.zip)

draw_style_box(cursor, r);
				}
			}
			
			int first_visible_separator = 0;
			{
				int lo = 0;
				int hi = separators.size();
				while (lo < hi) {
					const int mid = (lo + hi) / 2;
					if (separators[mid] < clip.position.y) {
						lo = mid + 1;
					} else {
						hi = mid;
					}
				}
				first_visible_separator = lo;
			}
			
			for (int i = first_visible_separator; i < separators.size(); i++) {
				if (separators[i] > clip.position.y + clip.size.y) {
					break; 
				}
				const int y = base_ofs.y + separators[i];
				draw_line(Vector2(theme_cache.panel_style->get_margin(SIDE_LEFT), y), Vector2(width, y), theme_cache.guide_color);
			}
		} break;
	}
}
void ItemList::_check_shape_changed() {