better multi-line while() statement handling

[lorenzwalthert]

Closes #966.

[codecov-commenter]

Codecov Report

Merging #967 (10f23c0) into main (af0e468) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #967   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files          47       47           
  Lines        2651     2653    +2     
=======================================
+ Hits         2383     2385    +2     
  Misses        268      268           

Impacted Files	Coverage Δ
R/rules-line-breaks.R	100.00% <100.00%> (ø)
R/io.R	88.67% <0.00%> (+0.44%)	⬆️

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[MichaelChirico]

Thanks for the quick fix here!!