Fix metadata of new layer after applying transform

[andreasmarnold]

The new layer was still being displayed with the moving layer's affine.
Corrected this to the reference layer's affine to fix the display problem.

I had some confusions getting my original apply_transform branch up to date. In the end I created a new branch for this ...

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1a60b60) 90.66% compared to head (ccc8941) 90.66%.
Report is 1 commits behind head on main.

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

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   90.66%   90.66%           
=======================================
  Files           7        7           
  Lines         257      257           
=======================================
  Hits          233      233           
  Misses         24       24           

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