### 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
queue_redraw();
				}
			}
		}
		if (!c.editable) {
			return -1; 
		}
		
		bool bring_up_editor = allow_reselect ? (c.selected && already_selected) : c.selected;
		String editor_text = c.text;
		switch (c.mode) {
			case TreeItem::CELL_MODE_STRING: {
				
				if (select_mode == SELECT_MULTI && (get_viewport()->get_processed_events_count() == focus_in_id || !already_cursor)) {
					bring_up_editor = false;
				}
			} break;
			case TreeItem::CELL_MODE_CHECK: {
				bring_up_editor = false; 
				if (force_edit_checkbox_only_on_checkbox) {
					if (x < theme_cache.checked->get_width()) {
						p_item->set_checked(col, !c.checked);
						item_edited(col, p_item, p_button);
					}
				} else {
					p_item->set_checked(col, !c.checked);
					item_edited(col, p_item, p_button);
				}
				click_handled = true;