The ornamental design for a windowvalance and trim, as shown and described
.
FIG. 1 is an enlarged view showing the cross-sectional profile of the trim
with the trim shown separately for ease of illustration; and,
FIG. 2 is a perspective view showing the trim installed on a window valance
as may be used in conjunction with a window, the dashed lines indicating
indeterminate length of the valance and trim.