It is a while I wanted to post this, but I always forgot!
When opening the console ('\'), I consistently get an extra '\' already showing in the command line, except the first time of each session.
- First time: 'clean' command line
- Second time and following: extra '\' at the beginning of the line, which has to be deleted manually
If I do not delete it and close and reopen the console, I get two, then three and so on, one for each time I open the console and do not delete the extra '\'.
System: Linux Mint 19.3, nVidia 1060.