MAINT: Increase readability of _merge_page

[j-t-1]

No description provided.

[j-t-1]

This PR is wrong, I should not have moved the annotations. Will either close or change...

[stefan6419846]

I am going to mark this PR as draft. Feel free to either close or mark it ready for review if you decided on an approach.

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.69%. Comparing base (15c42ff) to head (17afa32).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pypdf/_page.py	95.83%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3291   +/-   ##
=======================================
  Coverage   96.69%   96.69%           
=======================================
  Files          53       53           
  Lines        9024     9024           
  Branches     1674     1674           
=======================================
  Hits         8726     8726           
  Misses        176      176           
  Partials      122      122           

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[j-t-1]

@stefan6419846 code coverage has decreased but seems as if it should be the same? Moving the annotations is okay also.

[stefan6419846]

The case where https://github.com/py-pdf/pypdf/pull/3291/files#diff-153e5cee71ddf471246ff5c0e198345f005942a540a8f39297736f0b620d631dR1225 does not hold true is not covered by the tests (although it has never been as far as I can see). Are we able to test this as well?