[MNG-7018] Maven does not traverse all repos when downloading extensions from .mvn/extensions.xml

**[Michael Osipov](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=michael-o)** opened **[MNG-7018](https://issues.apache.org/jira/browse/MNG-7018?redirect=false)** and commented

Check out Maven from `MNG-6114`. Run Core ITs, see MNG-5771 fail. (Compare uploaded log files and settings). MNG-6114 orders all settings elements from global to local. I.e., repos from global settings come first. Here is the bug: One expects Maven to traverse all available repos to download artifacts, but Maven stops here with the first one. W/o MNG-6114 it works accidently because Central override was servered by a mirror.

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**Affects:** 3.6.3

**Attachments:**
- [master.log](https://issues.apache.org/jira/secure/attachment/13015236/master.log) (_2.63 kB_)
- [master-settings.xml](https://issues.apache.org/jira/secure/attachment/13015234/master-settings.xml) (_2.03 kB_)
- [MNG-6114.log](https://issues.apache.org/jira/secure/attachment/13015235/MNG-6114.log) (_10.58 kB_)
- [MNG-6114-settings.xml](https://issues.apache.org/jira/secure/attachment/13015233/MNG-6114-settings.xml) (_2.03 kB_)

**Issue Links:**
- [MNG-6114](https://issues.apache.org/jira/browse/MNG-6114) Elements from the global settings should be ordered before elements from the user settings
(_**"is caused by"**_)
- [MNG-5984](https://issues.apache.org/jira/browse/MNG-5984) Maven core extension resolution ignores repositories from activeByDefault profiles in settings.xml

Check out Maven from MNG-6114 and run the Core ITs, focusing on the MNG-5771 failure. Compare master.log, MNG-6114.log, and the two settings XML attachments to trace repository ordering and extension resolution. Done means Maven traverses all available repositories when downloading extensions from .mvn/extensions.xml.

Written by the indexing model from the issue text.