Avoid infinite recursion in set_common_prefix()

[jesper-friis]

Description

Avoid infinite recursion in set_common_prefix()

Type of change

• Bug fix.
• New feature.
• Documentation update.
• Test update.

Checklist

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (55e1885) 71.33% compared to head (715019d) 71.33%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #701   +/-   ##
=======================================
  Coverage   71.33%   71.33%           
=======================================
  Files          16       16           
  Lines        3387     3391    +4     
=======================================
+ Hits         2416     2419    +3     
- Misses        971      972    +1     

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