I know that in Visual Studio Code it is possible to edit settings to render vertical rulers (even with different settings for each file type).
What I need is a bit different. I have several files of data (fixed width), all .txt and I would like to quickly add vertical rulers with some mouse and keyboard actions (something like the import fixed width wizard in Excel). I do not need to save them or use the same settings again, therefore editing the settings for each file is not the ideal solution.
I tried to set multiple cursors (Alt click) and then extend the vertical selections, but it seems that multiple vertical selections do not work, anyway this would be a not so perfect workaround.