Delete Folder while Uploading

Keybase GUI Version: 4.4.0-20190829183920+8f13068775
Using Keybase on Mac with 'Enable Keybase in Finder' enabled.

Recently, I started uploading a 22+ GB folder to Keybase in one go... however, I realized that I had uploaded the wrong folder, and deleted it while it was uploading it's contents. This only partially worked, and left Keybase in a messy state ('still uploading' messages, hanging, errors, etc.) and didn't resolve without some fiddling and a restart (and even now it isn't fully fixed). This is probably due to the nature of some of the files I had in that folder, some over a few gigs in size.

TL;DR: Cancelling large folder upload causes errors.

No file, test, or entry point is identified. Start by reproducing the cancellation of a large folder upload through the Keybase GUI with Finder integration enabled on macOS, then trace the resulting still-uploading messages, hangs, and errors; done means cancelling leaves no broken upload state.

Written by the indexing model from the issue text.