Fix editor loses focus when toggling list and copy selects wrong target deck for filtered decks

[cything]

Fixes #3391 and #3338

[dae]

Thanks for contributing Shirish!

I've given this a test, and noticed it doesn't work correctly when the cursor is not at the bottom. For example, if you have a list of 3 elements, and the cursor is on the first, creating a list and then removing it again will move the cursor to the end. And since the current behaviour does seem to work correctly in some circumstances, this seems like a step in the wrong direction. So I'll cut that part out, and merge the other part of your PR.