Related to #1164: fix incorrect argument count with nested func in parenthesized sub-exporessions

[Aprax14]

Description

When a function argument contains an expression like 1+(ABS(A1)+A1)/2, the formula parser in prepareEvalInfixExp miscounts the outer function's arguments (e.g. IF or SUM), throwing errors like "IF accepts at most 3 arguments".

Root cause: when an inner function closes, the code checks whether the operand on opfdStack belongs to the current function or an outer expression by looking at the token directly below on opftStack. If a subexpression-start token "(" or another function-start token (e.g. SUM) sits between the function marker and the actual infix operator (e.g. +), this check fails and the operand gets wrongly consumed as a function argument.

Related Issue

#1164

Motivation and Context

The added unit tests would fail without this fix while they are valid in MS Excel.

How Has This Been Tested

Added unit tests

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.62%. Comparing base (90ff348) to head (bab8b27).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2348   +/-   ##
=======================================
  Coverage   99.62%   99.62%           
=======================================
  Files          32       32           
  Lines       26961    26969    +8     
=======================================
+ Hits        26859    26867    +8     
  Misses         53       53           
  Partials       49       49           

Flag	Coverage Δ
unittests	99.62% <100.00%> (+<0.01%)	⬆️

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[xuri]

Great work! I've made some changes based on your code branch.