rem: static void createDrawBuffer(Ruler * rPtr)
add: createDrawBuffer(Ruler * rPtr)
context: static void createDrawBuffer(Ruler * rPtr){    if(!rPtr->view->flags.realized)        return;    if (rPtr->drawBuffer)    XFreePixmap(rPtr->view->screen->display, rPtr->drawBuffer);    rPtr->drawBuffer = XCreatePixmap(rPtr->view->screen->display,              rPtr->view->window, rPtr->view->size.width, 40,                     rPtr->view->screen->depth);    XFillRectangle(rPtr->view->screen->display, rPtr->drawBuffer,                   rPtr->bgGC, 0, 0, rPtr->view->size.width, 40);}