Back when sidebar widgets was a plugin, I could use normal editing commands to change or rearrange text in a widget text box (highlighting lines or blocks of text to copy & paste elsewhere, etc).
But now that widgets have been incorporated into the newer WP releases, I can no longer use those commands. To delete a line of text I must backspace through it, letter by letter. If I want to move a line of text from one place to another, I actually have to delete the original line, then type it all over again into the new location – there’s no copy/paste function available.
I have one sidebar text widget that I constantly update (my Netflix movie queue), and this is getting fairly annoying.