### 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
ERR_FAIL_INDEX_V(p_column, columns.size(), -1);
	int column_width = get_column_minimum_width(p_column);
	if (columns[p_column].expand) {
		int expand_area = get_size().width;
		Ref<StyleBox> bg = theme_cache.panel_style;
		if (bg.is_valid()) {
			expand_area -= bg->get_margin(SIDE_LEFT) + bg->get_margin(SIDE_RIGHT);
		}
		if (v_scroll->is_visible_in_tree()) {
			expand_area -= v_scroll->get_combined_minimum_size().width;
		}
		int expanding_total = 0;
		for (int i = 0; i < columns.size(); i++) {
			expand_area -= get_column_minimum_width(i);
			if (columns[i].expand) {
				expanding_total += columns[i].expand_ratio;
			}
		}
		if (expand_area >= expanding_total && expanding_total > 0) {
			column_width += expand_area * columns[p_column].expand_ratio / expanding_total;
		}
	}
	return column_width;
}
void Tree::propagate_set_columns(TreeItem *p_item) {