Add context 'user_id' extraction for 'message_changed' and 'message_deleted' events

[eddyg]

I noticed that context.user_id was not being set for message_changed or message_deleted message subtype events. user is located in payload → event → message for message_changed events, and in payload → event → previous_message for message_deleted events.

The first and third commits are for message_changed (with tests); the fourth commit is for message_deleted (with tests).

The second commit addresses a typing issue I noticed by ensuring that in is not being compared to None (the original code would generate "in" not supported for type "None" warnings. I also removed the # type: ignore comments on the associated return statements as they don't seem to be required.

Category (place an x in each of the [ ])

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter
• Document pages under /docs
• Others

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run ./scripts/install_all_and_run_tests.sh after making the changes.

[seratch]

Hi @eddyg, thanks for sending this PR! Could you add the unit tests covering the pattern? Adding new files like the following would be easier to maintain for us. Please note that we need tests for both App and AsyncApp. Thanks!

• https://github.com/slackapi/bolt-python/blob/v1.15.1/tests/scenario_tests/test_message_thread_broadcast.py
• https://github.com/slackapi/bolt-python/blob/v1.15.1/tests/scenario_tests_async/test_message_thread_broadcast.py

[codecov]

Codecov Report

Merging #736 (e38b7d1) into main (87dccda) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #736   +/-   ##
=======================================
  Coverage   92.05%   92.06%           
=======================================
  Files         172      172           
  Lines        5869     5873    +4     
=======================================
+ Hits         5403     5407    +4     
  Misses        466      466           

Impacted Files	Coverage Δ
slack_bolt/request/internals.py	93.87% <100.00%> (+0.17%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[eddyg]

Hi @eddyg, thanks for sending this PR! Could you add the unit tests covering the pattern? Adding new files like the following would be easier to maintain for us. Please note that we need tests for both App and AsyncApp. Thanks!

Alright, I took a shot at a simple test case (including an async version) to verify context.user_id in message_changed events...

[seratch]

@eddyg Thanks for adding tests! I have a few things to verify before merging this. I will work on it early next week.

[seratch]

@eddyg Thanks again for this contribution! We've merged your changes at 5c8e2f2