[angularsen]

Follow-up to #1752. CLDR 48 (ICU on Ubuntu 26.04) changed the de-CH digit group separator from ’ to ', which is also a foot mark. On that data, Length.TryParseFeetInches had two problems:

Input (de-CH)	Before	After
1'000' 6"	false	1000.5 ft
5'10"	42.5 ft (510 inches, wrong with no error)	5 ft 10 in

Changes

• Try each foot mark as the end of the feet part, instead of only the first. This also handles a foot-mark decimal separator in compound input, such as 1'5' 6".
• When the culture's group separator is a foot mark, require digit groups of the culture's size. .NET number parsing ignores group placement, which is why 5'10 became 510.
• Cultures whose group separator is not a foot mark keep their existing lenient number parsing.
• Added tests with a pinned ' separator, plus one using the host's real de-CH separator.

Behavior to review

• 1'000" stays 1000 inches, and 5'100" is 5100 inches, because those are correctly grouped numbers in that culture. Feet-and-inches notation with a 3-digit inch value is not recognized there.
• 5'10' in such a culture now returns false; it was 510 ft.
• Only ParseFeetInches and TryParseFeetInches change. Length.Parse("5'10\"", de-CH) still returns 510 inches.
• A culture with ' as the decimal separator (none in CLDR, custom cultures only) still reads 5'5" as 5.5 inches.

Verified locally

• UnitsNet.slnx builds.
• New tests failed before the parser change (11 failures) and pass after.
• Full UnitsNet.Tests on net10.0 and net48 pass. Local runs use Windows ICU, so the host-separator test exercises ’ here and ' on CI.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98%. Comparing base (096ce0c) to head (2aa698b).

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1754   +/-   ##
======================================
  Coverage      98%     98%           
======================================
  Files         515     515           
  Lines       24092   24099    +7     
======================================
+ Hits        23692   23701    +9     
+ Misses        400     398    -2     

Flag	Coverage Δ
net48	97% <100%> (+<1%)	⬆️

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