Start an instance of Thunderbird and konsole. In T-Bird pick "write" and then enter several lines of text in the body of the message. Then do an ls or something in knosole to get some text. Copy and then paste this text below the text you've just typed. Position the cursor at the start of the pasted text and hit backspace a few times. Instead of the text being shifted up, a line of text will be deleted. So far, this seems to only happen with text taken from konsole. If I copy/paste text from Chrome I will not see this problem. Reproducible: Always Also fails in the latest kubuntu release
If you've upgraded since this report, do you still have this issue? If so,reopen w/ more info if you can.
Thanks for reminding me about this bugzilla. The problem was resolved and turned out to be actually a konsole issue. I should have recalled filing this... :-(
...a konsole issue that got fixed via another bugzilla (too early, no coffee)