vscode: support Terminal#exitStatus

[educphi]

What it does

Fixes #11139 by adding support for Terminal#exitStatus. This field is set with the TerminalExitStatus object when the terminal it is referring to is closed, and contains the exit code of its process, if one was provided when terminating.

How to test

@vince-fugnitto created a small extension to test this new feature : term-exit-0.0.1.zip
You can fin the source code for this extension on this repository

1. download and include the term-exit-0.0.1.zip test extension
2. build and start the application
3. open a terminal
4. run the command exit <code> in the open terminal. <code> must be an integer between 0 and 255, and will default to 0 if not provided.
5. terminal should close and extension will display its exit code, as shown in the picture below.

Test example

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

Signed-off-by: Philippe Ducas philippe.ducas@ericsson.com

[alvsan09]

I have tested the change using the provided plugin and it works fine 👍

The code looks good to me, I left a suggestion in inline comments.

One more observation is that you are using the master branch of your fork to trigger the PR,
It's best to create a feature branch containing your changes, you will be able to then work on multiple issues in parallel.

[msujew]

I'm happy with the changes 👍

• Closing the terminal widget manually leads to an undefined exit code
• If the terminal exits with an error code, it is correctly propagated to the plugin host
• Reloading the browser window does not trigger the terminal closed event.