The ornamental design for a romanshade having a mesh liner, as shown and described.
FIG. 1 is a rear view of the Roman shade having a mesh liner; and,
FIG. 2 is an enlarged view of a portion of the mesh liner circled in chain line in FIG. 1.
The bottom rail illustrated in FIG. 1 is shown in broken lines and forms no part of the claimed design. The Roman shade is shown with a symbolic break in its length, the appearance of any portion of the article between the break lines forms no part of the claimed design.