refactor: one less tmp use case

[maelle]

Related to #1328

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[maelle]

this might be the first time I find vertical alignment useful 😸

[schochastics]

@maelle it seems this change makes my PRs fail for R 4.0? https://github.com/igraph/rigraph/actions/runs/13567024838/job/37925237675?pr=1720 Do you think this is temporary (or random?) or do we need to switch to function(x)? Dont recall this error for this PR

[schochastics]

testing with #1722

[maelle]

oops so sorry

[schochastics]

no worries, should be fixed now. I also missed it

[maelle]

Thanks!