I found this odd behavior and wanted to report it in case it’s a bug. The behavior of moving the caret up/down after indenting a row is inconsistent: sometimes it goes down to the next row, sometimes it goes to the beginning of the current row. Here’s a screen recording, hopefully that makes it clear.
I know there’s a better way to accomplish this, but I was in text-editor mindset when I ran into it — thinking, “I’ll just tab-down tab-down tab-down and indent these lines.” 
Thanks for your time.