Revert changes in PR 333

[soininen]

This reverts PR #333 as discussed there. A new PR will be opened for the changes to sort out issues.

Re spine-tools/Spine-Toolbox#2431

Checklist before merging

• Documentation (also in Toolbox repo) is up-to-date
• Release notes in Toolbox repo have been updated
• Unit tests have been added/updated accordingly
• Code has been formatted by black
• Unit tests pass

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a97c794) 77.12% compared to head (58f12b3) 77.12%.
Report is 13 commits behind head on 0.8-dev.

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Additional details and impacted files

@@           Coverage Diff            @@
##           0.8-dev     #343   +/-   ##
========================================
  Coverage    77.12%   77.12%           
========================================
  Files           75       75           
  Lines         9241     9241           
  Branches      1950     1950           
========================================
  Hits          7127     7127           
  Misses        1781     1781           
  Partials       333      333           

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