Fix issue with P, % and ‰ used in StringFormat outside of the format item #3645
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Fix issue with P, % and ‰ used in the StringFormat property of NumericUpDown but outside of the format item. "{}{0:P}" would work but "{}{0:0.0} P" would not work correctly.
Unit test
Added additional asserts in appropriate unit tests.
Related Issues
This PR fixes a couple of problems mentioned in #3376 but does not resolve the issue completely. It only deals with using special characters outside of the format item. Other concerns in the issue is left unresolved.