The ornamental design for an article of seatingfurniture, as shown and described.
FIG. 1 is an isometric view of seating furniture incorporating our new design;
FIG. 2 is a left side elevation view thereof, wherein the right side elevation view is a mirror image;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom elevation view thereof; and,
FIG. 6 is a rear elevation view thereof.
The broken-away symbols in the drawings indicate the appearance of any portion of the article between the break lines forms no part of the claimed design.