"Notebook: Format Notebook" with Black completely mangles the notebook

[ldorigo]

Issue Type: Bug

Hello,

Formatting single cells with black works fine. I tried using the "format notebook" command, and it completely mangled my notebook - replacing random lines left and right and causing over an hour of work to recover my work (which is partly my fault for not committing more often - just mentioning it to point out it's a relatively bad bug).

I can provide the notebook on which this happens, it contains slightly private data so don't want to attach it publicly on this issue.

I've found an old issue #1060, which stated that formatting entire notebooks wasn't implemented yet - don't know if it's still valid? If that is the case, the command should be disabled until the functionality is implemented - rather than risking lots of lost work.

Extension version: 2021.8.2041215044
VS Code version: Code 1.60.2 (7f6ab5485bbc008386c4386d08766667e155244e, 2021-09-22T12:01:43.795Z)
OS version: Linux x64 5.14.6-zen1-1-zen
Restricted Mode: No

System Info

Item	Value
CPUs	AMD Ryzen 7 4800H with Radeon Graphics (16 x 1400)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off opengl: enabled_on rasterization: disabled_software skia_renderer: enabled_on video_decode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	2, 3, 2
Memory (System)	30.78GB (2.86GB free)
Process Argv	--crash-reporter-id 9614dc43-c276-4d0e-94fc-c84de505d77f
Screen Reader	no
VM	0%
DESKTOP_SESSION	plasma-i3
XDG_CURRENT_DESKTOP	KDE
XDG_SESSION_DESKTOP	KDE-i3
XDG_SESSION_TYPE	x11

[IanMatthewHuff]

@ldorigo I don't believe that you actually need to provide your file here. I just played with this a bit myself, and while it worked on some very basic files I was able to get some very mangled results with more complex files.

[greazer]

This is a dupe of: microsoft/vscode-python#16980. Should be fixed in the latest Python insiders extension. Will be released in a point release.