Duplicate (double) documentation generated for friend function

[scott-zhong]

Describe the bug
Duplicate (double) documentation generated for friend function. See the following testcase

/**
 * A docs
 */
class A
{
public:
    friend A operator*(const A& x, const A& y);
};

/**
 * \relates A
 * 
 * A operator* docs
 */
A operator*(const A& x, const A& y);

/**
 * B docs
 */
template <typename T>
class B
{
public:
    /**
     * B operator* docs
     */
    T operator*(void) const
    {
        return T();
    }
};

A operator*() is documented twice in Doxygen 1.8.18 - Doxygen trunk (eb11063*)

Screenshots
Doxygen 1.8.17:

Doxygen 1.8.18 - trunk (eb11063*)

To Reproduce
testcase.zip

Expected behavior
Single instance of A operator*() documentation

Version
1.8.18 - trunk (eb11063*)

[albert-github]

It looks like the difference is the result of:

369e821fc6870e9e6b30aa13d59592c12c760800 is the first bad commit
Date:   Wed Apr 8 22:10:56 2020 +0200

    Replaced MemberNameSDict by MemberNameLinkedMap based on LinkedMap

 src/clangparser.cpp  |    8 +-
 src/classdef.cpp     |   62 +-
 src/code.l           |   40 +-
 src/context.cpp      |   36 +-
 src/doxygen.cpp      | 1980 ++++++++++++++++++++++++--------------------------
 src/doxygen.h        |    6 +-
 src/fortrancode.l    |  193 ++---
 src/membername.cpp   |   43 +-
 src/membername.h     |   42 +-
 src/namespacedef.cpp |  138 ++--
 src/pre.l            |   15 +-
 src/searchindex.cpp  |   20 +-
 src/util.cpp         |   80 +-
 13 files changed, 1231 insertions(+), 1432 deletions(-)

[scott-zhong]

I think this is the same bug with template and friend function.

/**
 * A docs
 */
template< class T >
class A
{
public:

    friend A<double> fun(const A<double>& v);
};

/**
 * \relates A
 * fun docs
 */
A<double> fun(const A<double>& V);

/**
 * B docs
 */
template< class T >
class B
{
public:

    friend B<double> fun(const B<double>& v);
};

1.8.17

1.8.18 - trunk (eb11063)

[doxygen]

@scott-zhong Please verify if the referenced commit fixes the problem for you. Do not close the issue, this will be done automatically when the next official release becomes available.

[scott-zhong]

@doxygen This does fix it. Thank you!!!