The ornamental design for a wheelchaircover, as shown and described.
FIG. 1 is a perspective view of a wheelchair cover, showing my new design in use;
FIG. 2 is a perspective view thereof; without being placed on transport wheel chair.
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a top view thereof.
The broken line showing of a wheelchair in FIG. 1 and on the article itself in all figures is included for the purpose of illustrating environment and forms no part of the claimed design.