Accepting completion with alt insert mode stops editing notebook cell

[mjbvz]

Issue Type: Bug

1. Open a notebook
2. Edit a markdown notebook cell
3. In the cell, trigger path suggestions:

[](./|)

4. With completions showing, hold down shift and press enter to accept the suggestion in the alternatiev insert mode (switching to either insert or replace)

Bug
The cell stops being edited

VS Code version: Code - Insiders 1.64.0-insider (Universal) (3dda6ea7acb66ea8693032fe9631ccac629da770, 2022-01-27T08:39:44.269Z)
OS version: Darwin x64 21.3.0
Restricted Mode: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz (16 x 2400)
GPU Status	2d_canvas: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	3, 3, 3
Memory (System)	32.00GB (0.03GB free)
Process Argv	--crash-reporter-id 48781ca2-1705-4f64-9bab-325055aab55d
Screen Reader	no
VM	0%

[mjbvz]

The command we want here acceptAlternativeSelectedSuggestion

The one currently executed is notebook.cell.executeAndSelectBelow

[mjbvz]

Also happens in code cells. In those, shift+enter instead executes the cell

[rebornix]

It works without Jupyter Keymap extension. In the core, editor actions have higher weight than the notebook ones, so it works as expected. With the Jupyter keymap installed, the keymap has higher priority. To avoid this we need to filter suggestWidgetVisible out in the keymap context keys.