### 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
c.selected = false;
				}
				
			}
		}
	}
	if (!switched && r_in_range && *r_in_range && (p_current == p_selected || p_current == p_prev)) {
		*r_in_range = false;
	}
	TreeItem *c = p_current->first_child;
	while (c) {
		select_single_item(p_selected, c, p_col, p_prev, r_in_range, p_current->is_collapsed() || p_force_deselect);
		c = c->next;
	}
}
Rect2 Tree::search_item_rect(TreeItem *p_from, TreeItem *p_item) {
	return Rect2();
}
void Tree::_range_click_timeout() {
	if (range_item_last && !range_drag_enabled && Input::get_singleton()->is_mouse_button_pressed(MouseButton::LEFT)) {
		Point2 pos = get_local_mouse_position() - theme_cache.panel_style->get_offset();
		if (show_column_titles) {
			pos.y -= _get_title_button_height();
			if (pos.y < 0) {
				range_click_timer->stop();
				return;
			}
		}
		if (!root) {
			return;