I know long chat messages are bad, but sometimes one may need to paste something long to a chat message. So let's assume I need to paste the following:

> Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean eget congue justo. Sed commodo elit diam, nec vulputate neque vehicula sit amet. Integer sit amet ultrices eros. Aenean facilisis orci consectetur felis dignissim semper. Proin congue orci sed ante tempus viverra. Praesent ac enim molestie, scelerisque massa in, ornare velit. Ut ipsum arcu, dictum tempus cursus ut, dignissim aliquam ligula. Cras et auctor orci. Proin volutpat, quam id egestas tristique, eros ante congue mi, non tristique nibh purus non felis. Nulla dignissim risus ut ante elementum, ut consectetur ex elementum. Aliquam in ipsum scelerisque, fringilla felis in, maximus erat. Pellentesque congue, eros ac scelerisque tempus, augue felis tempus mi, at laoreet erat ipsum tristique lorem. In porta magna sed risus mattis accumsan.

(taken from [lipsum.com](https://lipsum.com/feed/html))

Before:

![blob](/image?hash=98b720f0cbd4a841f40309d306ca765682d1c4be0f39c01ec703e30dec2ca380)

After pasting to the input area:

![blob](/image?hash=f88c96aac0c161a710ad56d05f022bd2fe688d48e8f435c8613971f4cab1d6be)

The input area automatically enlarges. That's great!

But suppose I paste by mistake, so I need to undo. After that undo:

![blob](/image?hash=f38f3c097d49a2dbe9f5850ab030f4203e8cfcd0dd4263b42e0e942e6dabac57)

Now the input area doesn't change the size back to normal. It needs a refresh.

This bug is quite bad when I paste a long code by mistake. The chat is completely hidden.

![blob](/image?hash=25648aadd4c34c0cda13ff3b014662863494044fe73a93ea43b350f8fd8d4469)