After updating to 5.0, it appears that a text selection will change as more information is output to terminal, for example as logs are being echoed to it. Instead of the text selection scrolling with the text to keep the same selection, the text selection seems bound to rows/columns on the terminal window itself, and the text being displayed on the terminal will scroll through the selection as more text is added to the terminal.
Edit: Actually, this seems bound to the hardware. I’m seeing the scroll through behavior on a RB450G w/ ROS 5.0, fw 2.29, and the old behavior on a 532A w/ ROS 5.0, fw 2.18.