The first issue is that it's no longer possible to "Copy Contents to Clipboard" when viewing a backtrace. This functionality was removed here and replaced with "Copy Selected Items to Clipboard". The latter requires a selection be made first, whereas previously you could just right click anywhere on the backtrace and copy the entire contents immediately. This is almost 100% of the time what I want to do as a user; if I need to copy specific lines, I can do that once I've pasted it somewhere else.

Another much more frustrating issue with this is that if you're looking at a stack trace and only want to copy a few lines, you need to shift+click on the last line you're interested in in order to select it, but this also causes the editor to go to that line, which inevitably means changing the file that's open, which is definitely not what I want: I just want to select lines. With the old menu action, I could just copy the whole trace and edit out what I didn't want.