Recently when clicking 'Edit' the text-entry window no longer shows the full text. This only appears after a click in the input area. After this a subsequent Save or Cancel and pressing Edit again will yield all text, but after reloading the page the issue can again be reproduced.
I am using Firefox 73.0.1 on Ubuntu 18.
This is a FYI. I created an issue in Gitea tracker: https://github.com/go-gitea/gitea/issues/13652
(Note: I couldn't find details on the Gitea config for inclusion in the github issue, other than by looking in the html source, where I found the version)