chore: Move referrerHost to appConfig store (#3433)

app/javascript/widget/helpers/IframeEventHelper.js

@@ -0,0 +1,27 @@
+export const loadedEventConfig = () => {
+  return {
+    event: 'loaded',
+    config: {
+      authToken: window.authToken,
+      channelConfig: window.chatwootWebChannel,
+    },
+  };
+};
+
+export const getExtraSpaceToScroll = () => {
+  // This function calculates the extra space needed for the view to
+  // accomodate the height of close button + height of
+  // read messages button. So that scrollbar won't appear
+  const unreadMessageWrap = document.querySelector('.unread-messages');
+  const unreadCloseWrap = document.querySelector('.close-unread-wrap');
+  const readViewWrap = document.querySelector('.open-read-view-wrap');
+
+  if (!unreadMessageWrap) return 0;
+
+  // 24px to compensate the paddings
+  let extraHeight = 24 + unreadMessageWrap.scrollHeight;
+  if (unreadCloseWrap) extraHeight += unreadCloseWrap.scrollHeight;
+  if (readViewWrap) extraHeight += readViewWrap.scrollHeight;
+
+  return extraHeight;
+};