Collapse a Stack Overflow answer if it is too long, allowing easier access to the comment, and action sections

SOAnswerCollapse.js

// ==UserScript==
// @name         SO Answer Collapse
// @namespace    jacob-gray.github
// @version      0.1
// @description  Collapse a SO answer if it is too long
// @author       Jacob the Gray
// @match        http://stackoverflow.com/questions/*
// @include        /^https?:\/\/\w*.?(stackoverflow|stackexchange|serverfault|superuser|askubuntu|stackapps)\.com\/(questions|posts|review|tools)\/(?!tagged\/|new\/).*/
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    var styles = ".post-text:after{content:'';transition:.3s}.collapse-answer{overflow:hidden;position:relative}.collapse-answer:before{content:'Double-click to toggle collapse';position:absolute;bottom:10px;left:0;right:0;text-align:center;z-index:100;color:#2196F3;cursor:pointer}.collapse-answer:after{position:absolute;background:linear-gradient(transparent, white);top:0;left:0;width:100%;height:100%;z-index:99;cursor:pointer}",
        style = $("<style></style>").html(styles).appendTo("body"),
        ans = $(".answercell .post-text");

    var maxHeight = 700,
        collapseHeight = 200;

    ans.each(function(){
        var $this = $(this),
            height = $this.height();
        if(height > maxHeight){
            $this.addClass("collapse-answer").animate({height:collapseHeight},300);
        }
        $this.on("dblclick",function(){
            if($this.hasClass("collapse-answer")){
                $this.animate({height:height},{duration:300,complete:function(){
                    $this.removeClass("collapse-answer");
                }});
            }
            else $this.addClass("collapse-answer").animate({height:collapseHeight},300);
        });

    });
})();