Non-breakable vertical space

[Volodymyr Prokopyuk]

Hi,

Is there a way in Lilypond to insert a non-breakable vertical space to avoid page break between a section title and piece title?

Code with an undesired page break

  \markup \column {
    \fill-line { \fontsize #5 \bold \caps Section }
    \vspace #1 % <= this vertical space should be non-breakable
  }

  \tocSection tocSec1 \markup { Section }

  \tocItem \markup { Piece }

Thank you,

Vlad