### 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
if (cell.mode == CELL_MODE_CHECK) {
			size.width += parent_tree->theme_cache.checked->get_width() + parent_tree->theme_cache.h_separation;
		}
		if (cell.icon.is_valid()) {
			Size2i icon_size = cell.get_icon_size();
			if (cell.icon_max_w > 0 && icon_size.width > cell.icon_max_w) {
				icon_size.width = cell.icon_max_w;
			}
			size.width += icon_size.width + parent_tree->theme_cache.h_separation;
			size.height = MAX(size.height, icon_size.height);
		}
		
		for (int i = 0; i < cell.buttons.size(); i++) {
			Ref<Texture2D> texture = cell.buttons[i].texture;
			if (texture.is_valid()) {
				Size2 button_size = texture->get_size() + parent_tree->theme_cache.button_pressed->get_minimum_size();
				size.width += button_size.width;
				size.height = MAX(size.height, button_size.height);
			}
		}
		if (cell.buttons.size() >= 2) {
			size.width += (cell.buttons.size() - 1) * parent_tree->theme_cache.button_margin;
		}
		cells.write[p_column].cached_minimum_size = size;
		cells.write[p_column].cached_minimum_size_dirty = false;
	}
	return cell.cached_minimum_size;
}
void TreeItem::_call_recursive_bind(const Variant **p_args, int p_argcount, Callable::CallError &r_error) {