The limited drag mode used absolute mouse position to compute the
value (min + xPercent * range), causing an immediate jump away from
the property's current value at drag start. Unify both modes to use
the relative offset formula (number + offset * step), with the
limited mode only adding min/max clamping on top. Also removes the
cursor-constraining logic that was specific to the old absolute mode.
jessequ
Jesse Qu