### 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
ClassDB::bind_method(D_METHOD("set_icon_max_width", "column", "width"), &TreeItem::set_icon_max_width);
	ClassDB::bind_method(D_METHOD("get_icon_max_width", "column"), &TreeItem::get_icon_max_width);
	ClassDB::bind_method(D_METHOD("set_icon_modulate", "column", "modulate"), &TreeItem::set_icon_modulate);
	ClassDB::bind_method(D_METHOD("get_icon_modulate", "column"), &TreeItem::get_icon_modulate);
	ClassDB::bind_method(D_METHOD("set_range", "column", "value"), &TreeItem::set_range);
	ClassDB::bind_method(D_METHOD("get_range", "column"), &TreeItem::get_range);
	ClassDB::bind_method(D_METHOD("set_range_config", "column", "min", "max", "step", "expr"), &TreeItem::set_range_config, DEFVAL(false));
	ClassDB::bind_method(D_METHOD("get_range_config", "column"), &TreeItem::_get_range_config);
	ClassDB::bind_method(D_METHOD("set_metadata", "column", "meta"), &TreeItem::set_metadata);
	ClassDB::bind_method(D_METHOD("get_metadata", "column"), &TreeItem::get_metadata);
	ClassDB::bind_method(D_METHOD("set_custom_draw", "column", "object", "callback"), &TreeItem::set_custom_draw);
	ClassDB::bind_method(D_METHOD("set_collapsed", "enable"), &TreeItem::set_collapsed);
	ClassDB::bind_method(D_METHOD("is_collapsed"), &TreeItem::is_collapsed);
	ClassDB::bind_method(D_METHOD("set_collapsed_recursive", "enable"), &TreeItem::set_collapsed_recursive);
	ClassDB::bind_method(D_METHOD("is_any_collapsed", "only_visible"), &TreeItem::is_any_collapsed, DEFVAL(false));
	ClassDB::bind_method(D_METHOD("set_visible", "enable"), &TreeItem::set_visible);
	ClassDB::bind_method(D_METHOD("is_visible"), &TreeItem::is_visible);
	ClassDB::bind_method(D_METHOD("uncollapse_tree"), &TreeItem::uncollapse_tree);
	ClassDB::bind_method(D_METHOD("set_custom_minimum_height", "height"), &TreeItem::set_custom_minimum_height);
	ClassDB::bind_method(D_METHOD("get_custom_minimum_height"), &TreeItem::get_custom_minimum_height);
	ClassDB::bind_method(D_METHOD("set_selectable", "column", "selectable"), &TreeItem::set_selectable);
	ClassDB::bind_method(D_METHOD("is_selectable", "column"), &TreeItem::is_selectable);
	ClassDB::bind_method(D_METHOD("is_selected", "column"), &TreeItem::is_selected);
	ClassDB::bind_method(D_METHOD("select", "column"), &TreeItem::select);
	ClassDB::bind_method(D_METHOD("deselect", "column"), &TreeItem::deselect);
	ClassDB::bind_method(D_METHOD("set_editable", "column", "enabled"), &TreeItem::set_editable);
	ClassDB::bind_method(D_METHOD("is_editable", "column"), &TreeItem::is_editable);
	ClassDB::bind_method(D_METHOD("set_custom_color", "column", "color"), &TreeItem::set_custom_color);
	ClassDB::bind_method(D_METHOD("get_custom_color", "column"), &TreeItem::get_custom_color);
	ClassDB::bind_method(D_METHOD("clear_custom_color", "column"), &TreeItem::clear_custom_color);