Cut/paste is broken in Python Notebooks

[dimitry-ishenko]

Issue Type: Bug

Scenario 1:

1. Double click on a word.
2. Press Ctrl + X to cut the word.
3. The entire line disappears!
4. Press Ctrl + Z.
5. The line re-appears without the cut word.
6. Move to the location to paste the word.
7. Press Ctrl + V.
8. TWO copies of the ENTIRE LINE are pasted instead of the cut word.

As they say a picture is worth a 1000 words:

Scenario 2:

1. Double click on a word.
2. Press Ctrl + X to cut the word.
3. Move to the location to paste the word.
4. Press Ctrl + V.
5. TWO copies of the word are pasted.

Extension version: 2020.7.91728-dev
VS Code version: Code - Insiders 1.47.0-insider (04545fa, 2020-07-02T05:34:14.274Z)
OS version: Linux x64 5.4.0-39-generic

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-1065G7 CPU @ 1.30GHz (8 x 1291)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: disabled_software skia_renderer: disabled_off_ok video_decode: unavailable_off viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	1, 1, 1
Memory (System)	15.23GB (1.52GB free)
Process Argv	--no-sandbox --unity-launch
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	Unity
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	x11

[karthiknadig]

@dimitry-ishenko Does this occur if you disable all extensions ?

[dimitry-ishenko]

@karthiknadig sorry I've realized I never specified that it only happens in .ipynb Python Notebooks. If I disable all extensions other than the python extension, the problem is still there. (Obviously, if I disable all extensions including the python extension, I can no longer open notebooks.)

[DonJayamanne]

Closing as a dup of https://github.com/microsoft/vscode-python/issues/11796
@dimitry-ishenko Will ping u on the above issue.