The ornamental design for a case for a tabletcomputer, as shown and described.
FIG. 1 is a perspective view of a case for a tablet computer shown in an expanded state, showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a perspective view thereof, shown in a use state; and,
FIG. 9 is an enlarged view of the encircled portion marked “9” in FIG. 1.
The broken lines in the drawings depict portions of the tablet case that form no part of the claimed design. The broken lines forming the cross section marker in FIGS. 1 and 9 also form no part of the claim.