[рони]

Ubivectel,
замени целиком

kide.ajustar_scroll = function() {
    if (kide.scrolling) return;
    let scroll = kide.attr("KIDE_msgs", "scrollTop") - (kide.attr("KIDE_msgs", "scrollHeight") - kide.attr("KIDE_msgs", "clientHeight"));
    if(scroll < -100) return;
    if (kide.order == "bottom")
        kide.attr(
            "KIDE_msgs",
            "scrollTop",
            kide.attr("KIDE_msgs", "scrollHeight")
        );
    else kide.attr("KIDE_msgs", "scrollTop", 0);
};