Toggle extexify UI

toggleExtexify.js

function toggleExtexify() {
    document.getElementsByClassName("extexify-pane")[0].classList.toggle("fade-out")
    document.getElementsByClassName("extexify-backdrop")[0].classList.toggle("fade-out")

    var canvas = document.getElementById("extexify-canvas");
    canvas.width = canvas.clientWidth;
    canvas.height = canvas.clientHeight;

    points = [[]];
}