In compare window, if selecting inserted / deleted line in BEX View, remove selection from side where there is no line

[CodesAway]

Currently, it keeps the prior selection. For example, if there's an insert on the left, the right line is still selected, when it shouldn't be.

[CodesAway]

Can't figure out how to completely remove the other selection, but have it select first line, which meets the need that when you're in the middle of the file, it won't show the line selected if you select an insert / deleted line