Extend Whiteout property

[foxfanfare]

Hi all,

I wonder if it is possible to extend in the X-direction the whiteout
property on a grob?

For instance, I find in this exemple ( snippet
<http://lilypond.org/doc/v2.19/Documentation/snippets/expressive-marks#expressive-marks-using-the-whiteout-property>
 
), that the slurs are too close to the TimeSignature.

I know I can make a markup-box for a note, like
  -\markup {
      \with-dimensions #'(0 . 0) #'(0 . 0)
      \with-color #white
      \filled-box #'(-0.5 . 2) #'(7 . 8) #0 }

but I would prefer to use the original whiteout property of the
TimeSignature and only extend its width... 

I found that  snippet
<http://lilypond.org/doc/v2.19/Documentation/snippets/tweaks-and-overrides#tweaks-and-overrides-drawing-boxes-around-grobs>
  
also useful. So I can draw around the TimeSignature but cannot find how to
fill this box whith white colour...



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