Clipped "Save Edit" / "Cancel" buttons when editing longer posts in untall editor

## Problem
When editing posts, the "Save Edit" / "Cancel" buttons

are slightly off their intended positions like depicted in this screenshot:

## Observations
This happens under certain conditions, mostly observed when editing posts. It hasn't happened when adding new posts or when replying.

It looks like this **does not happen** with short posts on the first position i.e. where the distance from the top of the page is short. Saying that, it **does happen** with first posts which are vertically larger and also usually happens with subsequent posts on a page, as they usually **do** have a reasonable distance from the top.