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Shearwalls does not assign shear line force to or design any wall segment that has a ratio of height to width of greater then 3.5:1 as per CSA O86 11.4.1.2. The height is defined as the height of a wall itself, and does not include floor or ceiling joists attached to the wall.
Note that on the upper storey below a gable end, shear walls uses the height to the eave as the wall height, disregarding the triangular portion of the gable end. Using the eave height is not valid in the case of a tall wall composed of studs that extend to the roof, and where there is no ceiling at eave height. If there is a cathedral (sloped) ceiling, it is up to the designer to determine whether the shear wall segment meets the height-to-width limitation in 11.4.1.2. If it does not, then you can make the segment into a separate wall and designate that wall as a non-shear wall.
Note that in determining the hold-down force moment arm, the height to the sloping roof is considered. When calculating deflection, it is not. Refer to these topics for further explanation.