[jquast]

Supersedes #291

• Skip lines emptied by whitespace stripping in wrap
• Add tests for dropping leading whitespace-only lines in wrap
• libwcwidth: drop whitespace-only lines in wrap()

[codspeed]

Merging this PR will not alter performance

✅ 121 untouched benchmarks

---

_{Comparing jq/pr291-more (6cbd970) with master (b770e71)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.76%. Comparing base (b770e71) to head (6cbd970).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #292      +/-   ##
==========================================
+ Coverage   87.61%   87.76%   +0.15%     
==========================================
  Files          41       41              
  Lines        5611     5617       +6     
  Branches     1502     1504       +2     
==========================================
+ Hits         4916     4930      +14     
+ Misses        321      319       -2     
+ Partials      374      368       -6     

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