Hmmm, that video does show the cursor disappearing. Also, the scrollbar moving to the right when you make the line longer is correct (because it is trying to show the cursor), and jumping back to the left when you arrow to the beginning of a line is correct, but it doesn't seem like it should move back to the left when you just arrow left from the end of the line.

These do seem minor enough that they could be a bugfix. Let's go ahead and file a bug for these.