Allow horizontal resizing of the text window

This is a suggestion to improve the usage of the free screen area, to show useful text items, not only a grey area.
The situation arises especially when you work on a portable computer without a large external screen, so you need to zoom the text but this "eats" up screen space vertically.

Being 61 years old and not having the sharp eyes of a younger person brings up the need to zoom into the text using `Ctrl+Mousewheel`.

- It should be possible to adjust the left margin of the window, to make more space for text. The buttons will rearrange themselves but still fit in the area to the left of the text box.
* The buttons - they will rearrange themselves over multiple lines when needed when the text box' left margin is dragged towards the left.
* Dragging the text box' left margin towards the left stops when there is no more free space for the buttons.