Block analyzer uses an internal variable m_step to determine how
long to hold a bar up. This is dependant on framerate, however it is
only set on creation or resize of the analyzer. This patch changes
this value whenever the framerate is changed, preventing the analyzer
from appearing wildly fast or extremely slow until a restart.
This patch prevents the framerate of all analyzers from
increasing beyond the framerate set in the interface at all times.
It however will allow the analyser to redraw as often as required
to prevent artifacting when the play scrubber is drawn in front.
John Maguire
Mark Furneaux
Krzysztof A. Sobiecki
David Sansome