The ornamental design for a lightingfixture, as shown and described.
FIG. 1 is a front perspective view of a lighting fixture showing a first embodiment of our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a side view, the opposite side being a mirror image thereof;
FIG. 5 is a top view, the opposite side being a mirror image thereof;
FIG. 6 is a front perspective view of a lighting fixture showing a second embodiment of our new design;
FIG. 7 is a rear view thereof;
FIG. 8 is a front view thereof;
FIG. 9 is a side view, the opposite side being a mirror image thereof; and,
FIG. 10 is a top view, the opposite side being a mirror image thereof.
The dot-dash-dot broken lines represent unclaimed boundaries of the claimed design. The dot-dot broken lines represent environmental structure and form no part of the claimed design.