### 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 (rect.has_point(mpos)) {
							if (!edit_selected()) {
								emit_signal(SNAME("item_double_clicked"));
							}
						} else {
							emit_signal(SNAME("item_double_clicked"));
						}
					}
					pressing_for_editor = false;
				}
				if (drag_touching) {
					if (drag_speed == 0) {
						drag_touching_deaccel = false;
						drag_touching = false;
						set_physics_process_internal(false);
					} else {
						drag_touching_deaccel = true;
					}
				}
			}
			if (cache.click_type == Cache::CLICK_BUTTON && cache.click_item != nullptr) {
				
				cache.click_item = get_item_at_position(cache.click_pos);
				emit_signal("button_clicked", cache.click_item, cache.click_column, cache.click_id, mb->get_button_index());
			}
			cache.click_type = Cache::CLICK_NONE;
			cache.click_index = -1;
			cache.click_id = -1;
			cache.click_item = nullptr;
			cache.click_column = 0;