Do we need changedFolder signal?

[matty0ung]

Following on from #703, I see we declare changedFolder signal on NamedEntity but I can't find anywhere in the code where we actually emit this signal.

Is it something old that we can remove? Or is something currently broken because this signal isn't getting sent?

[mikfire]

I am honestly uncertain. Everything with folders seems to work, although I cannot drop a folder onto another folder. I would need to build the old code to remember if that feature worked or not.

Half a neuron is suggesting I wrote that expecting to need it, and then realized it wasn't needed. Since folders only ever existed in trees, I could simply call the folderChanged() method directly and not muck about with signals.

Let me pull the old code into a vm tomorrow and make sure of a few things. I will comment the connect in BtTreeModel out and see what breaks.