Remove traces of QObject::trUtf8 from documentation

... and from the duplicated Q_DECLARE_TR_FUNCTION macro for QXmlStream.
We expect source code to be utf8 encoded in Qt 6, so the function is gone.

Change-Id: Ie25329a54e709dc92a22893ad5ab023852300d81
Reviewed-by: Kai Koehne <kai.koehne@qt.io>

src/corelib/doc/snippets/code/src_corelib_kernel_qcoreapplication.cpp

@@ -126,8 +126,6 @@ private:
 //! [6]
 static inline QString tr(const char *sourceText,
                          const char *comment = nullptr);
-static inline QString trUtf8(const char *sourceText,
-                             const char *comment = nullptr);
 //! [6]
 
 

src/corelib/doc/src/objectmodel/metaobjects.qdoc

@@ -72,7 +72,7 @@
     \li QObject::inherits() function returns whether an object is an
        instance of a class that inherits a specified class within the
        QObject inheritance tree.
-    \li QObject::tr() and QObject::trUtf8() translate strings for
+    \li QObject::tr() translates strings for
        \l{Internationalization with Qt}{internationalization}.
     \li QObject::setProperty() and QObject::property()
        dynamically set and get properties by name.

src/corelib/kernel/qcoreapplication.cpp

@@ -660,8 +660,7 @@ void QCoreApplicationPrivate::initLocale()
     Translation files can be added or removed
     using installTranslator() and removeTranslator(). Application
     strings can be translated using translate(). The QObject::tr()
-    and QObject::trUtf8() functions are implemented in terms of
-    translate().
+    function is implemented in terms of translate().
 
     \section1 Accessing Command Line Arguments
 
@@ -3027,14 +3026,13 @@ void QCoreApplication::setEventDispatcher(QAbstractEventDispatcher *eventDispatc
     \macro Q_DECLARE_TR_FUNCTIONS(context)
     \relates QCoreApplication
 
-    The Q_DECLARE_TR_FUNCTIONS() macro declares and implements two
-    translation functions, \c tr() and \c trUtf8(), with these
-    signatures:
+    The Q_DECLARE_TR_FUNCTIONS() macro declares and implements the
+    translation function \c tr() with this signature:
 
     \snippet code/src_corelib_kernel_qcoreapplication.cpp 6
 
-    This macro is useful if you want to use QObject::tr() or
-    QObject::trUtf8() in classes that don't inherit from QObject.
+    This macro is useful if you want to use QObject::tr()  in classes
+    that don't inherit from QObject.
 
     Q_DECLARE_TR_FUNCTIONS() must appear at the very top of the
     class definition (before the first \c{public:} or \c{protected:}).
@@ -3045,7 +3043,7 @@ void QCoreApplication::setEventDispatcher(QAbstractEventDispatcher *eventDispatc
     The \a context parameter is normally the class name, but it can
     be any text.
 
-    \sa Q_OBJECT, QObject::tr(), QObject::trUtf8()
+    \sa Q_OBJECT, QObject::tr()
 */
 
 QT_END_NAMESPACE

src/corelib/serialization/qxmlstream.cpp

@@ -59,12 +59,8 @@
 public: \
     static inline QString tr(const char *sourceText, const char *comment = nullptr) \
         { Q_UNUSED(comment); return QString::fromUtf8(sourceText); } \
-    static inline QString trUtf8(const char *sourceText, const char *comment = nullptr) \
-        { Q_UNUSED(comment); return QString::fromUtf8(sourceText); } \
     static inline QString tr(const char *sourceText, const char*, int) \
         { return QString::fromUtf8(sourceText); } \
-    static inline QString trUtf8(const char *sourceText, const char*, int) \
-        { return QString::fromUtf8(sourceText); } \
 private:
 #endif
 #include <private/qmemory_p.h>