Reporting in from November 2023; this issue is still not fixed. I've been running old versions of the IDE so I hadn't run into this problem, but someone in my lab just started using 2.x. At first we were very confused about why they couldn't copy the serial monitor; I was shocked to discover that this is a known bug that's lasted for over a year now. For our application, this makes the 2.x version literally unusable.
As others have pointed out, having a "save serial monitor to .txt" button would be really nice, but lacking that, not being able to use ctrl-A/ctrl-C is maddening.
1 Like