This is not a new problem in RC2. It's been this way since beta versions of SE 2015 (but, of course, SE 2014 doesn't do this).
When you paste a text in Linux (doesn't happen in Windows), the pasted text is highlighted/selected. I need to de-select the text before I can do anything useful. For example, if I want to copy one line and paste it 10 times, I paste it once, deselect the pasted text (by moving the cursor for instance), and repeat these steps 9 more times. I used to be able to just paste it 10 times and done.
I'm using the Brief emulation mode, which I'm not sure matters. Could you please fix this behavior?