The ornamental design for a lightingfixture, as shown and described.
FIG. 1 is a perspective view of a lighting fixture illustrating my new design;
FIG. 2 is a side perspective view of the lighting fixture of FIG. 1;
FIG. 3 is a front elevational view of the lighting fixture of FIG. 1;
FIG. 4 is a rear elevational view of the lighting fixture of FIG. 1;
FIG. 5 is a side elevational view of one side of the lighting fixture of FIG. 1;
FIG. 6 is a side elevational view of the other side of the lighting fixture of FIG. 1;
FIG. 7 is a top plan view of the lighting fixture of FIG. 1; and,
FIG. 8 is a bottom plan view of the lighting fixture of FIG. 1.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design, while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.