Fixes #93332

Fixes #96421

Fixes #96679

make sure editState is CellEditState.Editing when text model changes, also make sure not to duplicate newlines,  #96398

 - ms-vscode.js-debug-nightly -> 2020.4.2917 at 2020-04-30T00:05:41.373Z

Fixes #96527

With the unified reopen-with code, we were no longer calling into the custom editor when reopening a custom editor with the default text editor. This change fixes that by making the custom editor explicitly provide the default editor as one of its overrides

Better fix for #96591 to also work correctly with notebooks

In the explorer->open with command, we need to call `getEditorOverrides` but do not have a real editor input. Rather than creating a fake editor input, we should just take uri for `getEditorOverrides`

Fixes #96591

fixes #95355

For #94516