format padding and text properties

[Eric Abrahamsen]

I'm trying to pad out a string that has had a face applied to it, and
it's not quite going as I'd hoped. In a nutshell:

(setq ss "bubba")
(put-text-property 0 (length ss) 'face 'my-face ss)
(format "%10s" ss)

--> #("      bubba" 0 5 (face my-face))

I'd like the face to stay with the actual string, not the spaces! Does
text property stickiness have anything to do with this? Does anyone have
any clever tips?

Using Emacs git...

Thanks!
Eric