#2431 Fix formula cfvo load error in ext icon sets#2432
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Summary
See #2431.
Loading a workbook with an icon set conditional formatting rule stored in
extLstthrew anInvalidOperationExceptionwhen a threshold usedtype="formula"with a numeric constant value.Cause
Icon sets using extended sets (
3Stars,3Triangles,5Boxes) or cross-sheet formulas are stored inextLstand read viaApplyIconSetExtValues. That reader routed any numeric value to theValuesetter without checking the cfvo type, and the setter rejectsValuewhenType == Formula. The regular icon set reader (ReadIcon) and the databar reader already had this guard.Fix
Added a
Type != Formulacheck inApplyIconSetExtValuesso formula thresholds are routed to theFormulaproperty, matching the other two readers. Also switched the numeric parse toInvariantCulture, consistent with the databar reader and correct for the invariant XML format.Tests
Added round-trip tests that build an icon set in code, save to a stream, and reload:
3Stars) with a numeric formula cfvo — reproduces the exception without the fix, passes with it.ReadIconpath against regression.Full conditional formatting regression suite passes.