detect double indented function declarations with one line break only as double indented

[lorenzwalthert]

Closes #1092.

[codecov-commenter]

Codecov Report

Merging #1094 (3372f00) into main (8208348) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1094   +/-   ##
=======================================
  Coverage   91.07%   91.07%           
=======================================
  Files          46       46           
  Lines        2711     2712    +1     
=======================================
+ Hits         2469     2470    +1     
  Misses        242      242           

Impacted Files	Coverage Δ
R/rules-line-breaks.R	100.00% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 8208348 is merged into main:

•   :ballot_box_with_check:cache_applying: 48.5ms -> 48.5ms [-0.83%, +0.78%]
•   :ballot_box_with_check:cache_recording: 779ms -> 778ms [-0.62%, +0.37%]
•   :ballot_box_with_check:without_cache: 1.87s -> 1.87s [-0.24%, +0.43%]

Further explanation regarding interpretation and methodology can be found in the documentation.

[IndrajeetPatil]

LGTM. Thanks!