I have tab size and indent size both set to 4, so most indented items are indented by 1 tab. This is what I want.

However, with a stacked list, I want the leading comma to be indented by 1 tab (and the first item by 1 tab plus 1 space).

At the moment, the commas are indented by 3 spaces. The only way I have found to change this is to set indent size to 5, but that then causes other indents to be 1 tab + 1 space.