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Fix cursor rotation jump when tablet pen is tilted horizontally. This changes to the correct values for the special case of tilt_x == 0.0. Reviewer (Jehan)'s note: computing the convergence of the tilt function in the `else` block, when tilt_x approaches 0, tilt value indeed converges to 0.25 with tilt_y > 0 and 0.75 (or -0.25 which is the same) with tilt_y < 0.
bb178539