add rstackfix plugin

rStackFix/plugin.js

+window.rStackFix = function () {
+  return {
+    id: "rStackFix",
+    init: function (deck) {
+      console.log("Custom plugin initialized!");
+      // Automatically load the initial fragment on a slide if the fragment
+      // has been defined with the 'preload' class
+      deck.on("slidechanged", function (event) {
+        console.log("slidechanged");
+        if (
+          event.currentSlide.querySelectorAll(
+            '.preload[data-fragment-index="0"]'
+          ).length > 0
+        ) {
+          deck.nextFragment();
+        }
+      });
+
+      // If the initial fragment on a slide has been defined with a 'preload' class
+      // then transition to the previous slide if the fragment is hidden
+      deck.on("fragmenthidden", function (event) {
+        console.log("fragmenthidden");
+        if (
+          event.fragment.hasAttribute("data-fragment-index") &&
+          event.fragment.classList.contains("preload")
+        ) {
+          if (event.fragment.attributes["data-fragment-index"].value == "0") {
+            deck.prev();
+          }
+        }
+      });
+    },
+  };
+};

rStackFix/plugin.yml

+name: rStackFix
+script: [plugin.js]