Fix print_status when using widechars in desc

[redbug312]

I found that passing widechars into set_description() would cause the width of description field miscalculated, and break the progress bar.

These are the screen records of before and after this fix.

[casperdcl]

Thanks @redbug312 - happy to merge if you can fix the unit tests for this PR (#410)

[redbug312]

I fixed Job #1475.2; But for Job #1475.10, this commit causes too much overhead in print_status(s), even 2.5 times slower than simple_progress() in the job

Maybe a more efficient solution or widechar-support flag is needed

[codecov-io]

Codecov Report

Merging #410 into master will increase coverage by 13.72%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master     #410       +/-   ##
===========================================
+ Coverage   85.56%   99.29%   +13.72%     
===========================================
  Files          15        7        -8     
  Lines         977      568      -409     
  Branches      169      108       -61     
===========================================
- Hits          836      564      -272     
+ Misses        136        3      -133     
+ Partials        5        1        -4

[mia-0]

This yields wrong results for combining character strings such as 'a\u0322' (returns 2 instead of 1) or strings containing non-printable characters, such as '\u200b\u200b\u200b' (returns 3 instead of 0).

What we’re interested in is not the string length but the width in terminal cells. The third-party wcwidth module does just that with its wcswidth function, which is a pure Python implementation of the libc equivalent.

[casperdcl]

thanks, like your suggestion @lachs0r

[casperdcl]

@FichteFoll thanks for bumping this. I don't have much time - will merge much quicker if someone fixes tests.