Long messages with no line breaks are not fully visible in input box

Versions

OS: NixOS unstable cc4677c36ee8d880e881459ad114fd2224b3ac1c
Gajim version: 1.0.0
GTK version: 3.22.26
Python-nbxmpp version: 0.6.4

Steps to reproduce the problem

Open a chat.
Enter a long multi-word message with no line breaks.

Expected behavior

The whole message is visible while I type it:

‎test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test

Actual behavior

If I press Up key the message scrolls to be fully visible as it should.