Stem direction overrides broken in 2.7.7

[Sven Axelsson]

Lilypond 2.7.7 Windows

If the first note in the music is a grace note, a stem direction override
will turn the grace note and not affect the normal notes. This is wrong
since the grace notes should only be affected by using add-grace-property,
not by normal overrides.

If the override is instead done in a \layout block, it works as expected.

\relative c''' { 
  \override Voice.Stem #'direction = #-1
  \grace { g32 } g,4 a \grace { g'32 } b,4 c
}

-- 
Sven Axelsson