Trailing whitespace fixes

[robinbowes]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Refactor the way box characters are defined so they do not break when the trailing-whitespace pre-commit hook is used.

Fixes #3049

I found that the pre-commit hooks were failing to install with this error. Upgrading to latest version fixed the problem.

I also added the trailing-whitespace pre-commit hook.

[robinbowes]

FYI, I used this search/replace regex in vim to make the substantial edit:

%s/    """\\\n\(....\)\n\(....\)\n\(....\)\n\(....\)\n\(....\)\n\(....\)\n\(....\)\n\(....\)\n"""/    "\1\\n"\r    "\2\\n"\r    "\3\\n"\r    "\4\\n"\r    "\5\\n"\r    "\6\\n"\r    "\7\\n"\r    "\8\\n"/

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (31c1fb6) 98.31% compared to head (008e4d3) 98.31%.
Report is 30 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3050   +/-   ##
=======================================
  Coverage   98.31%   98.31%           
=======================================
  Files          74       74           
  Lines        8016     8016           
=======================================
  Hits         7881     7881           
  Misses        135      135           

Flag	Coverage Δ
unittests	98.31% <ø> (ø)

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Files Changed	Coverage Δ
rich/box.py	100.00% <ø> (ø)

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[willmcgugan]

Thanks for the PR. Fixed in master.