The ornamental design for a chairliftseat with seatdividers, as shown and described.
FIG. 1 is a perspective view of a chairlift seat with seat dividers, showing my new design;
FIG. 2 is a side view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a rear view thereof; and,
FIG. 5 is a front elevation view thereof.
The broken lines showing a person on a chairlift seat is included for the purpose of illustrating environment of the design and forms no part of the claimed design.