### Godot version

4.0 beta 10

### System information

Windows 11 Vulkan

### Issue description

Looked through the issues list, but couldn't find something like this, sorry in advance if this has already been reported.

There is a few cases (in the pictures below) where list of Actions in Input Map may not always show a scrollbar even if the actions list overflows (I imagine this could also happen for the widget that Input Map uses).

![image](https://user-images.githubusercontent.com/39958198/210003566-cf60dbaf-921f-485b-b0a9-51ffc28d0244.png)

![New Bitmap image](https://user-images.githubusercontent.com/39958198/210004079-8eb2e6a1-0cf5-4a7c-8905-a4e3cfd0ec5d.png)

![image](https://user-images.githubusercontent.com/39958198/210004165-a6b6790b-248a-4f68-b4d0-b44b25afdf4f.png)

![image](https://user-images.githubusercontent.com/39958198/210004537-aca52194-a464-48b9-b818-24782706de45.png)


### Steps to reproduce

The pictures are clearer than anything I could write here: "a picture is worth 1000 words"

### Minimal reproduction project

N/A
for (int i = 0; i < columns.size(); i++) {
		update_column(i);
	}
	if (root) {
		update_item_cache(root);
	}
}
Size2 Tree::get_minimum_size() const {
	if (h_scroll_enabled && v_scroll_enabled) {
		return Size2();
	} else {
		Vector2 min_size = get_internal_min_size();
		Ref<StyleBox> bg = theme_cache.panel_style;
		if (bg.is_valid()) {
			min_size.x += bg->get_margin(SIDE_LEFT) + bg->get_margin(SIDE_RIGHT);
			min_size.y += bg->get_margin(SIDE_TOP) + bg->get_margin(SIDE_BOTTOM);
		}
		return Vector2(h_scroll_enabled ? 0 : min_size.x, v_scroll_enabled ? 0 : min_size.y);
	}
}
TreeItem *Tree::create_item(TreeItem *p_parent, int p_idx) {