From b0e7231f0146851d6238de03bd6cec05c61183b5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jon=20Haitz=20Legarreta=20Gorro=C3=B1o?=
 <jon.haitz.legarreta@gmail.com>
Date: Tue, 31 Dec 2024 18:13:09 -0500
Subject: [PATCH] DOC: Fix multiple group Doxygen warnings

Fix multiple group Doxygen warnings: enum classes cannot be members of
multiple groups: remove the additional grouping command, and leave the
one corresponding to the most specific group.

From the Doxygen documentation:
"Note that compound entities (like classes, files and namespaces) can be
put into multiple groups, but members (like variable, functions,
typedefs and enums) can only be a member of one group (...)."

https://www.doxygen.nl/manual/grouping.html#topics

Fixes:
```
Warning
Modules/IO/ImageBase/include/itkIOCommon.h:42:
 warning: Member AtomicPixel found in multiple @ingroup groups!
 The member will be put in group ITKIOImageBase, and not in group IOFilters
```

and
```
Warning
Modules/Filtering/FFT/include/itkComplexToComplexFFTImageFilter.h:41:
 warning: Member TransformDirection found in multiple @ingroup groups!
 The member will be put in group FourierTransform, and not in group ITKFFT
```

raised for example in:
https://open.cdash.org/viewBuildError.php?type=1&buildid=10117138
---
 .../Filtering/FFT/include/itkComplexToComplexFFTImageFilter.h    | 1 -
 Modules/IO/ImageBase/include/itkIOCommon.h                       | 1 -
 2 files changed, 2 deletions(-)

diff --git a/Modules/Filtering/FFT/include/itkComplexToComplexFFTImageFilter.h b/Modules/Filtering/FFT/include/itkComplexToComplexFFTImageFilter.h
index 88ed54c0c89..bafb24046f9 100644
--- a/Modules/Filtering/FFT/include/itkComplexToComplexFFTImageFilter.h
+++ b/Modules/Filtering/FFT/include/itkComplexToComplexFFTImageFilter.h
@@ -35,7 +35,6 @@ class ComplexToComplexFFTImageFilterEnums
 public:
   /**
    * \ingroup ITKFFT
-   * \ingroup FourierTransform
    * */
   enum class TransformDirection : uint8_t
   {
diff --git a/Modules/IO/ImageBase/include/itkIOCommon.h b/Modules/IO/ImageBase/include/itkIOCommon.h
index e06aadd734c..a016772cdfc 100644
--- a/Modules/IO/ImageBase/include/itkIOCommon.h
+++ b/Modules/IO/ImageBase/include/itkIOCommon.h
@@ -34,7 +34,6 @@ class IOCommonEnums
 {
 public:
   /**
-   * \ingroup IOFilters
    * \ingroup ITKIOImageBase
    * enumerated constants for the different data types
    */