Please add this functionality ASAP! I thought this was an issue with the new redesign and its ‘Readable line length’ option - I believe that the redesign reset that as a default (not sure). But finding this topic, it must be an older issue.
I would even call this a bug. The impact of it is that if you have a line that is as long as the editor width, or almost as long, you have a very tiny area to click to be able to put your cursor at the end of the line, or start dragging a selection from that.