I noticed that the code in the drag-n-drop for input is a copy-n-paste duplicate of code that used to be in file.cpp. At the moment it's duplicated by the extension mechanism, so we get two different code paths executed for dragging a file onto a doc versus importing a file via File|Import... menu item.

I was thinking that these should be changed, with the duplicated (and stale) code in interface.cpp removed and calling that in file.cpp. Are there any subtlties I might be missing in here, or is it just a classic rogue tile bug pattern and in bad need of that cleanup?