[Feature Request]: Preview output of HTTP Post does not show data unless you hit Right Arrow

### Apache Hop version?

2.7.0

### Java version?

openjdk version "11.0.15" 2022-04-19

### Operating system

macOS

### What happened?

I am performing a HTTP Post step and the response body is a JSON. When I click on the HTTP Post and select "View output" it shows an empty field for the response column. When I click in the first row cell of that column and hit the Right Arrow Key, it actually shows the JSON data.

This is very misleading because I would expect to see the data right away without having to click in there.

See https://youtu.be/ysgf0dv-3NQ for a demo.

### Issue Priority

Priority: 2

### Issue Component

Component: Hop Gui

Reproduce the HTTP Post step's View output behavior on Apache Hop 2.7.0 with the reported Java and macOS setup, focusing on the response column before and after pressing Right Arrow. Trace the Hop GUI output-preview entry point and identify why the JSON is not initially rendered; done means the response body appears immediately when the preview opens.

Written by the indexing model from the issue text.