### 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 (drag_touching) {
				if (drag_touching_deaccel) {
					float pos = v_scroll->get_value();
					pos += drag_speed * get_physics_process_delta_time();
					bool turnoff = false;
					if (pos < 0) {
						pos = 0;
						turnoff = true;
						set_physics_process_internal(false);
						drag_touching = false;
						drag_touching_deaccel = false;
					}
					if (pos > (v_scroll->get_max() - v_scroll->get_page())) {
						pos = v_scroll->get_max() - v_scroll->get_page();
						turnoff = true;
					}
					v_scroll->set_value(pos);
					float sgn = drag_speed < 0 ? -1 : 1;
					float val = Math::abs(drag_speed);
					val -= 1000 * get_physics_process_delta_time();
					if (val < 0) {
						turnoff = true;
					}
					drag_speed = sgn * val;
					if (turnoff) {
						set_physics_process_internal(false);
						drag_touching = false;
						drag_touching_deaccel = false;
					}
				}