Notebook tab should be drop target for files

Something I noticed from user observation of @katiemkblaede 😁

She dragged some files from the current view onto the notebook tab for another folder open in the window and dropped them, expecting them to be moved into the folder. Instead, Files counted it as an incomplete drag and kept the files in their original location.

Can we make notebook tabs themselves count as drag targets just like the background of a folder view?