Let other modules modify the target issues to action into

This sounds like a good idea, but I would say it is really specific to d.o, so let's create a hook to let modules, e.g. drupalorg_versioncontrol add extra logic when needed.
This issue could be about that, and we could create a related one for drupalorg.

+1 to the logic. Implementation, I have no opinion on but marvil07's idea sounds like a reasonable idea.

Here an initial try.

In the process I discovered some bugs, here related commits just for reference(I failed to create yet another issue for it):

    Issue #2227411 follow-up: Some extra fixes.
    
    - Typo on watchdog message.
    - filterRelevantOperationLabelNames() method call does not need to be
      executed per project issue loaded.
    - Only by pass current ref on getRelevantEventLabelNames() if not a
      branch, i.e. not all refs in the event.

Attached the patch which adds the new hook alter.
Also attached the drupalorg patch implementing the new hook alter(someone please create that issue in drupalorg project issue queue). Pending there the filter to remove issue if branch name does not contain the issue nid.

I did not yet tried the code, @drumm, any comments on the logic at the hook implementation? (mainly from drupalorg_versioncontrol/plugins/label_version_mapper/DrupalorgVersioncontrolLabelVersionMapperGit.class.php)

I found another kind-of-related little bug:

• 2ee5339 Check empty passed array in versioncontrol_project_issue_get_issue_operation_ids() before passing it to a query.

I have generalized a little to let pass the plugin name, so this hook can be call from both git_commits_as_comment and git_issue_mapper.

This time I could actually test/run the code and it seems to be working OK.

I created a ticket for drupalorg related code: #2363121: Restrict action into issues after versioncontrol_project_issue_git event processors

I think this part of the code is ready, @drumm, let me know if you want to review it before I add it.

After a quick chat with drumm in IRC, this is now added to upstream.

adding tag