### 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
return visible;
}
void TreeItem::uncollapse_tree() {
	TreeItem *t = this;
	while (t) {
		t->set_collapsed(false);
		t = t->parent;
	}
}
void TreeItem::set_custom_minimum_height(int p_height) {
	if (custom_min_height == p_height) {
		return;
	}
	custom_min_height = p_height;
	for (Cell &c : cells) {
		c.cached_minimum_size_dirty = true;
	}
	_changed_notify();
}
int TreeItem::get_custom_minimum_height() const {
	return custom_min_height;
}
TreeItem *TreeItem::create_child(int p_idx) {