continuation_indent_width is ignored, when use_tabs is True

[UnitedMarsupials]

I'm trying to follow the BSD style(9) guide even when using languages other than C. One particular aspect of that standard is that, although hierarchical indentation uses tabs, the line-continuation is done with four spaces.

Unfortunately, with use_tabs=True yapf seems to ignore the continuation_indent_width=4 -- indenting things like long function-calls with tabs too:

        p = subprocess.run(call_args,
            stderr = subprocess.PIPE,
            stdout = subprocess.PIPE,
            timeout = timeout)

instead of:

        p = subprocess.run(call_args,
            stderr = subprocess.PIPE,
            stdout = subprocess.PIPE,
            timeout = timeout)

Can anything be done about this, please?

[Spitfire1900]

The instead of block combines tabs and spaces. Line continuation should have tabs only. The current behavior is correct.