The ornamental design for a lightingfixture, as shown and described.
FIG. 1 is a right-side perspective view of a lighting fixture depicting a new design;
FIG. 2 is a left-side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a back elevational view thereof;
FIG. 5 is a left elevational view thereof;
FIG. 6 is a right elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a right-side perspective view in which an optional electrical cord is displayed.
The horizontal broken lines extending from the lighting fixture in FIGS. 7 and 8 and the vertical broken lines extending from the lighting fixture in FIGS. 5 and 6 represent environment which forms no part of the claimed design. The remaining broken line disclosures in the views represent portions of the lighting fixture that form no part of the claimed design.