### 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
emit_signal(SNAME("item_activated"));
				incr_search.clear();
			}
		}
		accept_event();
	} else if (p_event->is_action("ui_select", true) && p_event->is_pressed()) {
		if (select_mode == SELECT_MULTI) {
			if (!selected_item) {
				return;
			}
			if (selected_item->is_selected(selected_col)) {
				selected_item->deselect(selected_col);
				emit_signal(SNAME("multi_selected"), selected_item, selected_col, false);
			} else if (selected_item->is_selectable(selected_col)) {
				selected_item->select(selected_col);
				emit_signal(SNAME("multi_selected"), selected_item, selected_col, true);
			}
		}
		accept_event();
	}
	if (k.is_valid()) { 
		if (!k->is_pressed()) {
			return;
		}
		if (k->is_command_or_control_pressed() || (k->is_shift_pressed() && k->get_unicode() == 0) || k->is_meta_pressed()) {
			return;
		}
		if (!root) {
			return;
		}