The ornamental design for a computermouse with roller, as shown and described.
FIG. 1 is a perspective view of a computer mouse with roller showing our
new design; FIG. 2 is a top plan view thereof; FIG. 3 is a front
elevational view thereof; FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof; FIG. 6 is a rear
elevational view thereof; and, FIG. 7 is a bottom plan view thereof.