\displayMusic does not properly quote cons lilypond properties

[Jeff Epstein]

I'm trying to get the \displayMusic for the following:

   c1^\markup {
      \caps \center-align
      \override #'(box-padding . 0.5)
      \box "V. S."}

It results, partially, in this:

 (markup
   #:line
   (#:caps
    (#:center-align
     (#:override (box-padding . 0.5) (#:box "V. S."))))

Note that 

(box-padding . 0.5)

should be 

'(box-padding . 0.5)


I believe this is a bug.

Thank you. Let me know if there's anything else I can do.

PS. Thanks to Carl Sorensen for helping me discover this.