Staff lives too long when there are Score events

[Bertalan Fodor]

%BUG: Temporary staves live too long when there are something happening 
in the score (like a Time change or RehearsalMark):

\layout {

}

\version "2.5.26"

\paper {
 raggedright = ##t
}

\relative \new StaffGroup <<
 \context Staff = "3" { c1
 \new Staff {
   \set Staff.alignAboveContext = #"3"
   c8 d e f g a b c \stopStaff | }
   \once \override Score.RehearsalMark #'self-alignment-X = #-1
   \mark \markup { \musicglyph #"scripts.coda" "Coda:" }
   \time 3/4
 c2. }
>>