Fix split button gui, should always have a secondary button

[frankdekker]

Ensure the split button UI for the file tree correctly connects to the triple-dots button

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (74c30b5) to head (6a14cbb).
Report is 1 commits behind head on master.

❗ Current head 6a14cbb differs from pull request most recent head 5975647. Consider uploading reports for the commit 5975647 to get more accurate results

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@             Coverage Diff             @@
##              master       #79   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       395       395           
===========================================
  Files             82        82           
  Lines           1042      1042           
===========================================
  Hits            1042      1042           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.