bugfix width() value for very long CSI sequences

[jquast]

A case found when making tests for C11 coverage, about measurement mismatch for very-long 64+ byte
escape sequences

[codspeed]

Merging this PR will improve performance by 86.9%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 118 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_width_dense_ansi_control_codes_ignore	408.8 µs	218.7 µs	+86.9%

Tip

Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing jq/bugfix-verylong-csi (16adf4f) with master (b3fb5f2)}

[codecov]

Codecov Report

❌ Patch coverage is 79.31034% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.49%. Comparing base (b3fb5f2) to head (16adf4f).

Files with missing lines	Patch %	Lines
libwcwidth/src/width.c	78.57%	2 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #272      +/-   ##
==========================================
- Coverage   87.50%   87.49%   -0.01%     
==========================================
  Files          41       41              
  Lines        5593     5614      +21     
  Branches     1494     1501       +7     
==========================================
+ Hits         4894     4912      +18     
- Misses        323      324       +1     
- Partials      376      378       +2     

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