[Bug 694641] Re: doxygen incorrectly handles parameter names with umlauts in C#

[paolog]

Unreproducible with doxygen 1.9.1 on Debian 11 (bullseye). I saved the C# snippet above as a.cs with cp1252 encoding, set INPUT = a.cs and updated Doxyfile with doxygen -u.
No warning is issued.
I attach the full example.

** Attachment added: "694641.zip"
   https://bugs.launchpad.net/ubuntu/+source/doxygen/+bug/694641/+attachment/5479239/+files/694641.zip

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Title:
  doxygen incorrectly handles parameter names with umlauts in C#

Status in doxygen package in Ubuntu:
  New

Bug description:
  Binary package hint: doxygen

  I am trying to document a constructor:

          /// <summary>
          /// Initialisiert diesen IdErzeuger mit einem Präfix ohne Zähler.
          /// </summary>
          /// <param name="präfix">Der Präfix.</param>
          public IdErzeuger(string präfix)
              : this(präfix, false)
          {
          }

  Which results in the following warnings:
  IdErzeuger.cs:33: warning: argument 'pr' of command @param is not found in the argument list of Iev.IdErzeuger::IdErzeuger(string präfix)
  IdErzeuger.cs:33: warning: argument 'auml' of command @param is not found in the argument list of Iev.IdErzeuger::IdErzeuger(string präfix)
  IdErzeuger.cs:33: warning: argument 'fix' of command @param is not found in the argument list of Iev.IdErzeuger::IdErzeuger(string präfix)
  IdErzeuger.cs:33: warning: The following parameters of Iev::IdErzeuger::IdErzeuger(string präfix) are not documented:
    parameter 'präfix'

  When I open the compiled HTML and man documentation, the parameter is
  documented correctly.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: doxygen 1.7.1-1
  ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
  Uname: Linux 2.6.35-24-generic x86_64
  Architecture: amd64
  Date: Mon Dec 27 01:45:16 2010
  InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101008)
  ProcEnviron:
   LANGUAGE=
   PATH=(custom, user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: doxygen

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