It was really annoying mistake in original support of logarithmic color space
for sequencer which made adjustment layers be working in linear space. Seems
this was only an issue for modifiers in adjustment effect.
Now all modifiers are applying in sequencer's color space (in fact, this was
fixed in svn rev50275).
To preserve compatibility of Mango grading added this option which probably
wouldn't be used by others.
Sergey Sharybin
5f512bec47