"Also, please just copy-paste the session from your terminal in future."
To do this in a Windows terminal, right-click anywhere in the text and select "Mark". (You can also select "Mark" by clicking on the top-left icon and going to the "Edit" submenu.) Now you can draw a rectangle with your mouse, or with the arrow keys and shift.
Once you're satisfied with your rectangle, right-click in the window again or press enter. The contents of the rectangle are now in your clipboard, not including trailing whitespace.
You can cancel by doing something else, like pressing escape.
The rectangle interface might seem a little insane, but I'm half-looking-forward to the time when it comes in handy for copying tabular data or ASCII art. Or Epigram programs. :-p
