[vim/vim] Add test for function strwidth() (#2931)

[Dominique Pellé]

This PR adds a test for function strwidth() which was not tested
according to codecov:

https://codecov.io/gh/vim/vim/src/master/src/evalfunc.c#L11816

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/2931

Commit Summary

• Add test for function strwidth()

File Changes

• M src/testdir/test_functions.vim (24)

Patch Links:

• https://github.com/vim/vim/pull/2931.patch
• https://github.com/vim/vim/pull/2931.diff

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[Codecov]

Codecov Report

Merging #2931 into master will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2931      +/-   ##
==========================================
+ Coverage   75.34%   75.67%   +0.32%     
==========================================
  Files          92       92              
  Lines      132552   135019    +2467     
==========================================
+ Hits        99871   102171    +2300     
- Misses      32681    32848     +167

Impacted Files	Coverage Δ
src/if_python3.c	74.8% <0%> (-1.38%)	⬇️
src/if_python.c	76.55% <0%> (-1.31%)	⬇️
src/spellfile.c	73.94% <0%> (-1.05%)	⬇️
src/if_perl.xs	85.86% <0%> (-0.36%)	⬇️
src/netbeans.c	27.03% <0%> (-0.28%)	⬇️
src/libvterm/src/screen.c	58.97% <0%> (-0.25%)	⬇️
src/if_lua.c	54.17% <0%> (-0.16%)	⬇️
src/main.c	57.51% <0%> (-0.16%)	⬇️
src/eval.c	81.55% <0%> (-0.11%)	⬇️
src/regexp.c	82.61% <0%> (-0.08%)	⬇️
... and 67 more

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[Bram Moolenaar]

Closed #2931 via 42ab17b.