[Bug] Incrementing `patch` version automatically on `main` without tags nor specific commit messages

[ni-fgenois]

Discussed in #2660

^{Originally posted by franknarf8 April 13, 2021}
Hello,

I have just upgraded my GitVersion to the latest, but I can't find a way to reproduce the behavior I expect, and used to achieve with the previous GitVersion. (the change appeared between since 5.0.0)

When using Mainline, I would expect that each merge commits to master cause the patch version to increment. (Without any commit messages required)

Using the following GitVersion.yml (I'm generating pip versions here, please disregard the branches) :

mode: Mainline
next-version: 1.0.0
branches:
  release:
    tag: 'rc'
  feature:
    regex: ^features?[/-]|^(pull|pull\-requests|pr)[/-]
    tag: 'dev'
  develop:
    tag: 'a'
  hotfix:
    tag: 'post'
ignore:
  sha: []
merge-message-formats: {}

With this dummy git repo :

*   0bac05d 3 minutes ago  (HEAD -> master)
|\
| * 2922409 3 minutes ago  (feature/first-feature)
| * 2246a3e 7 minutes ago
|/
* bc00c9f 7 minutes ago  (tag: 1.2.3)

GitVersion 5.6.8 is inferring : 1.2.3
whereas 5.0.0 inferred : 1.2.4

I would expect 1.2.4 here, how can I achieve this?

[github-actions]

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