compute_tip_xy (tip_f, parms, dx, dy, FRAME_PIXEL_WIDTH (tip_f),
FRAME_PIXEL_HEIGHT (tip_f), &root_x, &root_y);
XMoveWindow (FRAME_X_DISPLAY (tip_f), FRAME_X_WINDOW (tip_f),
root_x, root_y);
compute_tip_xy (tip_f, parms, dx, dy, FRAME_PIXEL_WIDTH (tip_f),
FRAME_PIXEL_HEIGHT (tip_f), &root_x, &root_y);
XMoveWindow (FRAME_X_DISPLAY (tip_f), FRAME_X_WINDOW (tip_f),
root_x, root_y);