// ==UserScript==
// @name         Github - Color issues title blue & scroll to last message on title click.
// @namespace    rtasegase54tw54zwe54t
// @version      0.2
// @description  Color issues title blue and scroll to last comment on title click.
// @author       Me
// @match        https://github.com/*/*/issues*
// @require      https://code.jquery.com/jquery-3.2.1.min.js
// @grant        none
// ==/UserScript==
(function(){
    var s=document.createElement("style");
    s.innerHTML=".js-issue-title{color:blue;cursor:pointer}";
    document.querySelector("head").appendChild(s);
    //Define timer variable
    var timer=false;
    //Registers events
    var addClickEvent=function(){
        //Register our event again
        $('.js-issue-title').off("click");
        $('.js-issue-title').on("click",function(){
            $("html, body").animate({
                scrollTop: $('.timeline-comment-header').last().offset().top
            }, 200);
        });
    };
    //Schedule a timer event
    var scheduleUpdater=function(){
        //Only if we have not already scheduled
        if(!timer)
        {
            //run function in timer that registers click events and resets the timer
            timer=window.setTimeout(function(){addClickEvent();timer=false;},100);
        }
    };
    //Watch over document changes
    document.body.addEventListener('DOMSubtreeModified', function (){
        //Do not update immediately, otherwise we can run into an infinite loop.
        scheduleUpdater();
    }, false);
    //Register event for all existing elements
    addClickEvent();
})();