### 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 (!tree) {
		return;
	}
	set_collapsed(p_collapsed);
	TreeItem *child = get_first_child();
	while (child) {
		child->set_collapsed_recursive(p_collapsed);
		child = child->get_next();
	}
}
bool TreeItem::_is_any_collapsed(bool p_only_visible) {
	TreeItem *child = get_first_child();
	
	while (child) {
		if (child->get_first_child() && child->is_collapsed() && (!p_only_visible || (child->is_visible() && child->get_visible_child_count()))) {
			return true;
		}
		child = child->get_next();
	}
	child = get_first_child();
	
	while (child) {
		if (child->get_first_child() && (!p_only_visible || (child->is_visible() && child->get_visible_child_count())) && child->_is_any_collapsed(p_only_visible)) {
			return true;
		}
		child = child->get_next();
	}
	return false;
}
bool TreeItem::is_any_collapsed(bool p_only_visible) {