The ornamental design for a tri-view mirror, as shown and described.
FIG. 1 is a front left perspective view of a tri-view mirror showing my new design, showing the side panel mirrors extended horizontally;
FIG. 2 is a front perspective thereof;
FIG. 3 is an enlarged front perspective view of the embodiment of FIG. 1 illustrating the decorative ornamentation atop the center mirror and the arched molding above the mirror; and,
FIG. 4 is an enlarged perspective view of a portion of the side panel mirror and center mirror of the embodiment of FIG. 1, illustrating the edge molding around the center mirror.