Failure to align continuation lines with spaces

Have tested this issue on both QtCreator 2.4.1 (from the SDK) and 2.5.2 (standalone).

I'm trying to get "smart tab" behavior from QtCreator with the following settings (in Tools > Options > C++ > Edit > General):

Tab policy: Tabs Only
Tab size: 3
Indent size: 3
Align continuation lines: With spaces

I have attached a screenshot of the preview of Tools > Options > C++ > Edit > Alignment, illustrating exactly how smart tabs should look. However, when I actually write exactly the code shown in the preview, it uses tabs for alignment. This file is also attached.

What I want is exactly what is shown in the preview... I'm just not getting it.