The ornamental design for a manualwindowshade, as shown and described.
FIG. 1 is a perspective view of a manual window shade, in an open configuration, showing my new design, with the shade shown broken away to indicate it has no specific height;
FIG. 2 is a top view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a rear view thereof.
The left side view is a mirror image of the right side view.