I am making an online editor 2T8H, which came from the Punycode code xn--2t8h corresponding to the 
emoji.
Introductions apart, I have a bug in my editor’s custom unnamed code editor library with scrollbars. Neither does my syntax highlighting pre neither does my textarea want to shrink to reasonable height, so once you overflow the editor, the scrollbar stays the same even when you un-overflow it. It’s just there until you reload it.
So, what’s my problem? Here is the source code, can you help? And no, switching to another premade editor like Ace or Codemirror is not an answer for me, sorry. 