Merge branch 'feature/Fix_onscroll_IOS' into 'develop'

IOSでスクロールするとメッセージロードを複数呼び出す問題対応

See merge request !182

public_new/js/chat-room.js

 var lastscrollvalue;
 var lastscrollvalue;
 window.onscroll = function () {
 window.onscroll = function () {
+  if (beforeScroll == window.scrollY) {
+    return;
+  }
   beforeScroll = window.scrollY;
   beforeScroll = window.scrollY;
   const beforeHeight = $(".room_container").height();
   const beforeHeight = $(".room_container").height();
   messageCount = $(".chat_message").length;
   messageCount = $(".chat_message").length;