update

src/assets/styles/prosemirror.scss

@@ -2,7 +2,7 @@
   outline: 0;
   border: 0;
   font-size: 16px;
-  white-space: pre;
+  white-space: pre-wrap;
   &:not(.ProseMirror-static) {
     user-select: text;
   }