[Feature request] Option to automatically add comma after switching images

[younyokel]

Just a simple option to insert a comma after the last tag of the current image when changing the file. I often catch myself accidentally continuing the last tag.

[Nenotriple]

This was the original behavior for a long time, it was changed when I redid a lot of the autocomplete logic. (It's often easier to remove or simplify things sometimes)

I've added your request to the v1.97_dev todo list #50, I'll try to get around to all that soon when I have some time to dive back in.

I really want to say thanks for using this app, that fact that you've stuck around and continue to offer your input really means a lot to me.

Thank you very much <3