diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/global/qflags.h qtbase-opensource-src-5.6.3/src/corelib/global/qflags.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/global/qflags.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/global/qflags.h	2023-10-17 20:31:37.670315600 +0800
@@ -139,6 +139,11 @@
     Q_DECL_CONSTEXPR inline bool operator!() const Q_DECL_NOTHROW { return !i; }
 
     Q_DECL_CONSTEXPR inline bool testFlag(Enum f) const Q_DECL_NOTHROW { return (i & Int(f)) == Int(f) && (Int(f) != 0 || i == Int(f) ); }
+    Q_DECL_RELAXED_CONSTEXPR inline QFlags &setFlag(Enum f, bool on = true) Q_DECL_NOTHROW
+    {
+        return on ? (*this |= f) : (*this &= ~Int(f));
+    }
+
 private:
 #ifdef Q_COMPILER_INITIALIZER_LISTS
     Q_DECL_CONSTEXPR static inline Int initializer_list_helper(typename std::initializer_list<Enum>::const_iterator it,
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/global/qglobal.h qtbase-opensource-src-5.6.3/src/corelib/global/qglobal.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/global/qglobal.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/global/qglobal.h	2023-10-17 14:38:05.801809800 +0800
@@ -67,6 +67,9 @@
 #  define QT_NO_UNSHARABLE_CONTAINERS
 #endif
 
+// Red Panda C++: workaround.
+#define QT_CONFIG(feature) QT_SUPPORTS(feature)
+
 /* These two macros makes it possible to turn the builtin line expander into a
  * string literal. */
 #define QT_STRINGIFY2(x) #x
@@ -1054,6 +1057,53 @@
 
 #endif // QT_NO_TRANSLATION
 
+template <typename... Args>
+struct QNonConstOverload
+{
+    template <typename R, typename T>
+    Q_DECL_CONSTEXPR auto operator()(R (T::*ptr)(Args...)) const Q_DECL_NOTHROW -> decltype(ptr)
+    { return ptr; }
+
+    template <typename R, typename T>
+    static Q_DECL_CONSTEXPR auto of(R (T::*ptr)(Args...)) Q_DECL_NOTHROW -> decltype(ptr)
+    { return ptr; }
+};
+
+template <typename... Args>
+struct QConstOverload
+{
+    template <typename R, typename T>
+    Q_DECL_CONSTEXPR auto operator()(R (T::*ptr)(Args...) const) const Q_DECL_NOTHROW -> decltype(ptr)
+    { return ptr; }
+
+    template <typename R, typename T>
+    static Q_DECL_CONSTEXPR auto of(R (T::*ptr)(Args...) const) Q_DECL_NOTHROW -> decltype(ptr)
+    { return ptr; }
+};
+
+template <typename... Args>
+struct QOverload : QConstOverload<Args...>, QNonConstOverload<Args...>
+{
+    using QConstOverload<Args...>::of;
+    using QConstOverload<Args...>::operator();
+    using QNonConstOverload<Args...>::of;
+    using QNonConstOverload<Args...>::operator();
+
+    template <typename R>
+    Q_DECL_CONSTEXPR auto operator()(R (*ptr)(Args...)) const Q_DECL_NOTHROW -> decltype(ptr)
+    { return ptr; }
+
+    template <typename R>
+    static Q_DECL_CONSTEXPR auto of(R (*ptr)(Args...)) Q_DECL_NOTHROW -> decltype(ptr)
+    { return ptr; }
+};
+
+#if defined(__cpp_variable_templates) && __cpp_variable_templates >= 201304 // C++14
+template <typename... Args> Q_CONSTEXPR Q_DECL_UNUSED QOverload<Args...> qOverload = {};
+template <typename... Args> Q_CONSTEXPR Q_DECL_UNUSED QConstOverload<Args...> qConstOverload = {};
+template <typename... Args> Q_CONSTEXPR Q_DECL_UNUSED QNonConstOverload<Args...> qNonConstOverload = {};
+#endif
+
 /*
    When RTTI is not available, define this macro to force any uses of
    dynamic_cast to cause a compile failure.
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/global/qsystemdetection.h qtbase-opensource-src-5.6.3/src/corelib/global/qsystemdetection.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/global/qsystemdetection.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/global/qsystemdetection.h	2023-10-17 22:26:59.822029100 +0800
@@ -184,6 +184,7 @@
 #endif
 
 #if defined(Q_OS_WIN32) || defined(Q_OS_WIN64) || defined(Q_OS_WINCE) || defined(Q_OS_WINRT)
+#  define Q_OS_WINDOWS
 #  define Q_OS_WIN
 #endif
 
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/io/qdir.cpp qtbase-opensource-src-5.6.3/src/corelib/io/qdir.cpp
--- qtbase-opensource-src-5.6.3.orig/src/corelib/io/qdir.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/io/qdir.cpp	2023-10-17 14:38:05.801809800 +0800
@@ -1812,6 +1812,13 @@
     return QFile::exists(filePath(name));
 }
 
+bool QDir::isEmpty(Filters filters) const
+{
+    const auto d = d_ptr.constData();
+    QDirIterator it(d->dirEntry.filePath(), d->nameFilters, filters);
+    return !it.hasNext();
+}
+
 /*!
     Returns a list of the root directories on this system.
 
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/io/qdir.h qtbase-opensource-src-5.6.3/src/corelib/io/qdir.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/io/qdir.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/io/qdir.h	2023-10-17 14:38:05.801809800 +0800
@@ -138,6 +138,8 @@
     void setSorting(SortFlags sort);
 
     uint count() const;
+    bool isEmpty(Filters filters = Filters(AllEntries | NoDotAndDotDot)) const;
+
     QString operator[](int) const;
 
     static QStringList nameFiltersFromString(const QString &nameFilter);
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/io/qprocess.cpp qtbase-opensource-src-5.6.3/src/corelib/io/qprocess.cpp
--- qtbase-opensource-src-5.6.3.orig/src/corelib/io/qprocess.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/io/qprocess.cpp	2023-10-18 09:11:02.546767400 +0800
@@ -1535,6 +1535,18 @@
     d->nativeArguments = arguments;
 }
 
+QProcess::CreateProcessArgumentModifier QProcess::createProcessArgumentsModifier() const
+{
+    Q_D(const QProcess);
+    return d->modifyCreateProcessArgs;
+}
+
+void QProcess::setCreateProcessArgumentsModifier(CreateProcessArgumentModifier modifier)
+{
+    Q_D(QProcess);
+    d->modifyCreateProcessArgs = modifier;
+}
+
 #endif
 
 /*!
@@ -2124,6 +2136,20 @@
     d->start(mode);
 }
 
+bool QProcess::startDetached(qint64 *pid)
+{
+    Q_D(QProcess);
+    if (d->processState != NotRunning) {
+        qWarning("QProcess::startDetached: Process is already running");
+        return false;
+    }
+    if (d->program.isEmpty()) {
+        d->setErrorAndEmit(QProcess::FailedToStart, tr("No program defined"));
+        return false;
+    }
+    return d->startDetached(pid);
+}
+
 /*!
     Starts the program set by setProgram() with arguments set by setArguments().
     The OpenMode is set to \a mode.
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/io/qprocess.h qtbase-opensource-src-5.6.3/src/corelib/io/qprocess.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/io/qprocess.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/io/qprocess.h	2023-10-18 09:09:01.053605200 +0800
@@ -38,6 +38,8 @@
 #include <QtCore/qstringlist.h>
 #include <QtCore/qshareddata.h>
 
+#include <functional>
+
 QT_BEGIN_NAMESPACE
 
 
@@ -48,6 +50,8 @@
 #else
 QT_END_NAMESPACE
 typedef struct _PROCESS_INFORMATION *Q_PID;
+typedef struct _SECURITY_ATTRIBUTES Q_SECURITY_ATTRIBUTES;
+typedef struct _STARTUPINFOW Q_STARTUPINFO;
 QT_BEGIN_NAMESPACE
 #endif
 
@@ -151,6 +155,7 @@
     void start(const QString &command, OpenMode mode = ReadWrite);
 #endif
     void start(OpenMode mode = ReadWrite);
+    bool startDetached(qint64 *pid = nullptr);
     bool open(OpenMode mode = ReadWrite) Q_DECL_OVERRIDE;
 
     QString program() const;
@@ -180,6 +185,22 @@
 #if defined(Q_OS_WIN)
     QString nativeArguments() const;
     void setNativeArguments(const QString &arguments);
+    struct CreateProcessArguments
+    {
+        const wchar_t *applicationName;
+        wchar_t *arguments;
+        Q_SECURITY_ATTRIBUTES *processAttributes;
+        Q_SECURITY_ATTRIBUTES *threadAttributes;
+        bool inheritHandles;
+        unsigned long flags;
+        void *environment;
+        const wchar_t *currentDirectory;
+        Q_STARTUPINFO *startupInfo;
+        Q_PID processInformation;
+    };
+    typedef std::function<void(CreateProcessArguments *)> CreateProcessArgumentModifier;
+    CreateProcessArgumentModifier createProcessArgumentsModifier() const;
+    void setCreateProcessArgumentsModifier(CreateProcessArgumentModifier modifier);
 #endif
 
     QString workingDirectory() const;
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/io/qprocess_p.h qtbase-opensource-src-5.6.3/src/corelib/io/qprocess_p.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/io/qprocess_p.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/io/qprocess_p.h	2023-10-17 14:38:05.822849000 +0800
@@ -326,6 +326,7 @@
     QStringList arguments;
 #if defined(Q_OS_WIN)
     QString nativeArguments;
+    QProcess::CreateProcessArgumentModifier modifyCreateProcessArgs;
 #endif
     QProcessEnvironment environment;
 
@@ -355,6 +356,7 @@
     bool waitForDeadChild();
 #endif
 #ifdef Q_OS_WIN
+    bool callCreateProcess(QProcess::CreateProcessArguments *cpargs);
     bool drainOutputPipes();
     void flushPipeWriter();
     qint64 pipeWriterBytesToWrite() const;
@@ -363,6 +365,8 @@
     static bool startDetached(const QString &program, const QStringList &arguments, const QString &workingDirectory = QString(),
                               qint64 *pid = 0);
 
+    bool startDetached(qint64 *pPid);
+
     int exitCode;
     QProcess::ExitStatus exitStatus;
     bool crashed;
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/io/qprocess_win.cpp qtbase-opensource-src-5.6.3/src/corelib/io/qprocess_win.cpp
--- qtbase-opensource-src-5.6.3.orig/src/corelib/io/qprocess_win.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/io/qprocess_win.cpp	2023-10-18 09:15:27.039781400 +0800
@@ -330,7 +330,8 @@
     destroyPipe(channel->pipe);
 }
 
-static QString qt_create_commandline(const QString &program, const QStringList &arguments)
+static QString qt_create_commandline(const QString &program, const QStringList &arguments,
+                                     const QString &nativeArguments = QString())
 {
     QString args;
     if (!program.isEmpty()) {
@@ -359,6 +360,13 @@
         }
         args += QLatin1Char(' ') + tmp;
     }
+
+    if (!nativeArguments.isEmpty()) {
+        if (!args.isEmpty())
+             args += QLatin1Char(' ');
+        args += nativeArguments;
+    }
+
     return args;
 }
 
@@ -444,6 +452,30 @@
     return envlist;
 }
 
+bool QProcessPrivate::callCreateProcess(QProcess::CreateProcessArguments *cpargs)
+{
+    if (modifyCreateProcessArgs)
+        modifyCreateProcessArgs(cpargs);
+    bool success = CreateProcess(cpargs->applicationName, cpargs->arguments,
+                                 cpargs->processAttributes, cpargs->threadAttributes,
+                                 cpargs->inheritHandles, cpargs->flags, cpargs->environment,
+                                 cpargs->currentDirectory, cpargs->startupInfo,
+                                 cpargs->processInformation);
+    if (stdinChannel.pipe[0] != INVALID_Q_PIPE) {
+        CloseHandle(stdinChannel.pipe[0]);
+        stdinChannel.pipe[0] = INVALID_Q_PIPE;
+    }
+    if (stdoutChannel.pipe[1] != INVALID_Q_PIPE) {
+        CloseHandle(stdoutChannel.pipe[1]);
+        stdoutChannel.pipe[1] = INVALID_Q_PIPE;
+    }
+    if (stderrChannel.pipe[1] != INVALID_Q_PIPE) {
+        CloseHandle(stderrChannel.pipe[1]);
+        stderrChannel.pipe[1] = INVALID_Q_PIPE;
+    }
+    return success;
+}
+
 void QProcessPrivate::startProcess()
 {
     Q_Q(QProcess);
@@ -498,11 +530,22 @@
                                  0, 0, 0,
                                  stdinChannel.pipe[0], stdoutChannel.pipe[1], stderrChannel.pipe[1]
     };
-    success = CreateProcess(0, (wchar_t*)args.utf16(),
-                            0, 0, TRUE, dwCreationFlags,
-                            environment.isEmpty() ? 0 : envlist.data(),
-                            workingDirectory.isEmpty() ? 0 : (wchar_t*)QDir::toNativeSeparators(workingDirectory).utf16(),
-                            &startupInfo, pid);
+
+    const QString nativeWorkingDirectory = QDir::toNativeSeparators(workingDirectory);
+    QProcess::CreateProcessArguments cpargs = {
+        0, (wchar_t*)args.utf16(),
+        0, 0, TRUE, dwCreationFlags,
+        environment.isEmpty() ? 0 : envlist.data(),
+        nativeWorkingDirectory.isEmpty() ? Q_NULLPTR : (wchar_t*)nativeWorkingDirectory.utf16(),
+        &startupInfo, pid
+    };
+    if (modifyCreateProcessArgs)
+        modifyCreateProcessArgs(&cpargs);
+    success = CreateProcess(cpargs.applicationName, cpargs.arguments, cpargs.processAttributes,
+                            cpargs.threadAttributes, cpargs.inheritHandles, cpargs.flags,
+                            cpargs.environment, cpargs.currentDirectory, cpargs.startupInfo,
+                            cpargs.processInformation);
+
     QString errorString;
     if (!success) {
         // Capture the error string before we do CloseHandle below
@@ -818,6 +861,7 @@
 // Use ShellExecuteEx() to trigger an UAC prompt when CreateProcess()fails
 // with ERROR_ELEVATION_REQUIRED.
 static bool startDetachedUacPrompt(const QString &programIn, const QStringList &arguments,
+                                   const QString &nativeArguments,
                                    const QString &workingDir, qint64 *pid)
 {
     typedef BOOL (WINAPI *ShellExecuteExType)(SHELLEXECUTEINFOW *);
@@ -828,11 +872,13 @@
     if (!shellExecuteEx)
         return false;
 
-    const QString args = qt_create_commandline(QString(), arguments); // needs arguments only
+    const QString args = qt_create_commandline(QString(),                   // needs arguments only
+                                               arguments, nativeArguments);
     SHELLEXECUTEINFOW shellExecuteExInfo;
     memset(&shellExecuteExInfo, 0, sizeof(SHELLEXECUTEINFOW));
     shellExecuteExInfo.cbSize = sizeof(SHELLEXECUTEINFOW);
-    shellExecuteExInfo.fMask = SEE_MASK_NOCLOSEPROCESS | SEE_MASK_UNICODE | SEE_MASK_FLAG_NO_UI;
+    shellExecuteExInfo.fMask = SEE_MASK_NOCLOSEPROCESS | SEE_MASK_UNICODE | SEE_MASK_FLAG_NO_UI | SEE_MASK_CLASSNAME;
+    shellExecuteExInfo.lpClass = L"exefile";
     shellExecuteExInfo.lpVerb = L"runas";
     const QString program = QDir::toNativeSeparators(programIn);
     shellExecuteExInfo.lpFile = reinterpret_cast<LPCWSTR>(program.utf16());
@@ -850,6 +896,12 @@
     return true;
 }
 
+static bool startDetachedUacPrompt(const QString &programIn, const QStringList &arguments,
+                                   const QString &workingDir, qint64 *pid)
+{
+    return startDetachedUacPrompt(programIn, arguments, QString(), workingDir, pid);
+}
+
 bool QProcessPrivate::startDetached(const QString &program, const QStringList &arguments, const QString &workingDir, qint64 *pid)
 {
     static const DWORD errorElevationRequired = 740;
@@ -880,6 +932,75 @@
     return success;
 }
 
+bool QProcessPrivate::startDetached(qint64 *pid)
+{
+    static const DWORD errorElevationRequired = 740;
+
+    if ((stdinChannel.type == Channel::Redirect && !openChannel(stdinChannel))
+            || (stdoutChannel.type == Channel::Redirect && !openChannel(stdoutChannel))
+            || (stderrChannel.type == Channel::Redirect && !openChannel(stderrChannel))) {
+        closeChannel(&stdinChannel);
+        closeChannel(&stdoutChannel);
+        closeChannel(&stderrChannel);
+        return false;
+    }
+
+    QString args = qt_create_commandline(program, arguments, nativeArguments);
+    bool success = false;
+    PROCESS_INFORMATION pinfo;
+
+    void *envPtr = nullptr;
+    QByteArray envlist;
+    if (environment.d.constData()) {
+        envlist = qt_create_environment(environment.d.constData()->hash);
+        envPtr = envlist.data();
+    }
+
+    DWORD dwCreationFlags = (GetConsoleWindow() ? 0 : CREATE_NO_WINDOW);
+    dwCreationFlags |= CREATE_UNICODE_ENVIRONMENT;
+    STARTUPINFOW startupInfo = { sizeof( STARTUPINFO ), 0, 0, 0,
+                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
+                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
+                                 0, 0, 0,
+                                 STARTF_USESTDHANDLES,
+                                 0, 0, 0,
+                                 stdinChannel.pipe[0], stdoutChannel.pipe[1], stderrChannel.pipe[1]
+                               };
+
+    const bool inheritHandles = stdinChannel.type == Channel::Redirect
+            || stdoutChannel.type == Channel::Redirect
+            || stderrChannel.type == Channel::Redirect;
+    QProcess::CreateProcessArguments cpargs = {
+        nullptr, reinterpret_cast<wchar_t *>(const_cast<ushort *>(args.utf16())),
+        nullptr, nullptr, inheritHandles, dwCreationFlags, envPtr,
+        workingDirectory.isEmpty()
+            ? nullptr : reinterpret_cast<const wchar_t *>(workingDirectory.utf16()),
+        &startupInfo, &pinfo
+    };
+    success = callCreateProcess(&cpargs);
+
+    if (success) {
+        CloseHandle(pinfo.hThread);
+        CloseHandle(pinfo.hProcess);
+        if (pid)
+            *pid = pinfo.dwProcessId;
+    } else if (GetLastError() == errorElevationRequired) {
+        if (envPtr)
+            qWarning("QProcess: custom environment will be ignored for detached elevated process.");
+        if (!stdinChannel.file.isEmpty() || !stdoutChannel.file.isEmpty()
+                || !stderrChannel.file.isEmpty()) {
+            qWarning("QProcess: file redirection is unsupported for detached elevated processes.");
+        }
+        success = startDetachedUacPrompt(program, arguments, nativeArguments,
+                                         workingDirectory, pid);
+    }
+
+    closeChannel(&stdinChannel);
+    closeChannel(&stdoutChannel);
+    closeChannel(&stderrChannel);
+    return success;
+}
+
 QT_END_NAMESPACE
 
 #endif // QT_NO_PROCESS
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/plugin/quuid.cpp qtbase-opensource-src-5.6.3/src/corelib/plugin/quuid.cpp
--- qtbase-opensource-src-5.6.3.orig/src/corelib/plugin/quuid.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/plugin/quuid.cpp	2023-10-17 14:38:05.822849000 +0800
@@ -43,6 +43,8 @@
 #endif
 QT_BEGIN_NAMESPACE
 
+enum { MaxStringUuidLength = 38 };
+
 template <class Char, class Integral>
 void _q_toHex(Char *&dst, Integral value)
 {
@@ -91,6 +93,30 @@
     *dst = Char('}');
 }
 
+static char *_q_uuidToHex(const QUuid &uuid, char *dst, QUuid::StringFormat mode = QUuid::WithBraces)
+{
+    if ((mode & QUuid::WithoutBraces) == 0)
+        *dst++ = '{';
+    _q_toHex(dst, uuid.data1);
+    if ((mode & QUuid::Id128) != QUuid::Id128)
+        *dst++ = '-';
+    _q_toHex(dst, uuid.data2);
+    if ((mode & QUuid::Id128) != QUuid::Id128)
+        *dst++ = '-';
+    _q_toHex(dst, uuid.data3);
+    if ((mode & QUuid::Id128) != QUuid::Id128)
+        *dst++ = '-';
+    for (int i = 0; i < 2; i++)
+        _q_toHex(dst, uuid.data4[i]);
+    if ((mode & QUuid::Id128) != QUuid::Id128)
+        *dst++ = '-';
+    for (int i = 2; i < 8; i++)
+        _q_toHex(dst, uuid.data4[i]);
+    if ((mode & QUuid::WithoutBraces) == 0)
+        *dst++ = '}';
+    return dst;
+}
+
 template <class Char>
 bool _q_uuidFromHex(const Char *&src, uint &d1, ushort &d2, ushort &d3, uchar (&d4)[8])
 {
@@ -550,6 +576,13 @@
     return result;
 }
 
+QString QUuid::toString(QUuid::StringFormat mode) const
+{
+    char latin1[MaxStringUuidLength];
+    const auto end = _q_uuidToHex(*this, latin1, mode);
+    return QString::fromLatin1(latin1, end - latin1);
+}
+
 /*!
     Returns the binary representation of this QUuid. The byte array is
     formatted as five hex fields separated by '-' and enclosed in
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/plugin/quuid.h qtbase-opensource-src-5.6.3/src/corelib/plugin/quuid.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/plugin/quuid.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/plugin/quuid.h	2023-10-17 14:38:05.838486200 +0800
@@ -74,6 +74,12 @@
         Sha1                 = 5 // 0 1 0 1
     };
 
+    enum StringFormat {
+        WithBraces      = 0,
+        WithoutBraces   = 1,
+        Id128           = 3
+    };
+
 #if defined(Q_COMPILER_UNIFORM_INIT) && !defined(Q_QDOC)
     Q_DECL_CONSTEXPR QUuid() Q_DECL_NOTHROW : data1(0), data2(0), data3(0), data4{0,0,0,0,0,0,0,0} {}
 
@@ -108,6 +114,7 @@
     QUuid(const QString &);
     QUuid(const char *);
     QString toString() const;
+    QString toString(StringFormat mode) const;
     QUuid(const QByteArray &);
     QByteArray toByteArray() const;
     QByteArray toRfc4122() const;
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qchar.h qtbase-opensource-src-5.6.3/src/corelib/tools/qchar.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qchar.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/tools/qchar.h	2023-10-17 14:38:05.838486200 +0800
@@ -572,6 +572,21 @@
 Q_DECL_CONSTEXPR inline bool operator> (QChar c1, QChar c2) { return  operator< (c2, c1); }
 Q_DECL_CONSTEXPR inline bool operator<=(QChar c1, QChar c2) { return !operator< (c2, c1); }
 
+Q_DECL_CONSTEXPR inline bool operator==(QChar lhs, std::nullptr_t) Q_DECL_NOTHROW { return lhs.isNull(); }
+Q_DECL_CONSTEXPR inline bool operator< (QChar,     std::nullptr_t) Q_DECL_NOTHROW { return false; }
+Q_DECL_CONSTEXPR inline bool operator==(std::nullptr_t, QChar rhs) Q_DECL_NOTHROW { return rhs.isNull(); }
+Q_DECL_CONSTEXPR inline bool operator< (std::nullptr_t, QChar rhs) Q_DECL_NOTHROW { return !rhs.isNull(); }
+
+Q_DECL_CONSTEXPR inline bool operator!=(QChar lhs, std::nullptr_t) Q_DECL_NOTHROW { return !operator==(lhs, nullptr); }
+Q_DECL_CONSTEXPR inline bool operator>=(QChar lhs, std::nullptr_t) Q_DECL_NOTHROW { return !operator< (lhs, nullptr); }
+Q_DECL_CONSTEXPR inline bool operator> (QChar lhs, std::nullptr_t) Q_DECL_NOTHROW { return  operator< (nullptr, lhs); }
+Q_DECL_CONSTEXPR inline bool operator<=(QChar lhs, std::nullptr_t) Q_DECL_NOTHROW { return !operator< (nullptr, lhs); }
+
+Q_DECL_CONSTEXPR inline bool operator!=(std::nullptr_t, QChar rhs) Q_DECL_NOTHROW { return !operator==(nullptr, rhs); }
+Q_DECL_CONSTEXPR inline bool operator>=(std::nullptr_t, QChar rhs) Q_DECL_NOTHROW { return !operator< (nullptr, rhs); }
+Q_DECL_CONSTEXPR inline bool operator> (std::nullptr_t, QChar rhs) Q_DECL_NOTHROW { return  operator< (rhs, nullptr); }
+Q_DECL_CONSTEXPR inline bool operator<=(std::nullptr_t, QChar rhs) Q_DECL_NOTHROW { return !operator< (rhs, nullptr); }
+
 #ifndef QT_NO_DATASTREAM
 Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QChar);
 Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QChar &);
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qdatetime.cpp qtbase-opensource-src-5.6.3/src/corelib/tools/qdatetime.cpp
--- qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qdatetime.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/tools/qdatetime.cpp	2023-10-17 14:38:05.838486200 +0800
@@ -4135,6 +4135,17 @@
                    - julianDayFromDate(1970, 1, 1)) * Q_INT64_C(86400000);
 }
 
+qint64 QDateTime::currentSecsSinceEpoch() Q_DECL_NOTHROW
+{
+    SYSTEMTIME st;
+    memset(&st, 0, sizeof(SYSTEMTIME));
+    GetSystemTime(&st);
+
+    return st.wHour * SECS_PER_HOUR + st.wMinute * SECS_PER_MIN + st.wSecond +
+            qint64(julianDayFromDate(st.wYear, st.wMonth, st.wDay)
+                   - julianDayFromDate(1970, 1, 1)) * Q_INT64_C(86400);
+}
+
 #elif defined(Q_OS_UNIX)
 QDate QDate::currentDate()
 {
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qdatetime.h qtbase-opensource-src-5.6.3/src/corelib/tools/qdatetime.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qdatetime.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/tools/qdatetime.h	2023-10-17 14:38:05.838486200 +0800
@@ -312,6 +312,7 @@
     static QDateTime fromMSecsSinceEpoch(qint64 msecs, const QTimeZone &timeZone);
 #endif
     static qint64 currentMSecsSinceEpoch() Q_DECL_NOTHROW;
+    static qint64 currentSecsSinceEpoch() Q_DECL_NOTHROW;
 
 #if defined(Q_OS_MAC) || defined(Q_QDOC)
     static QDateTime fromCFDate(CFDateRef date);
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qlocale.cpp qtbase-opensource-src-5.6.3/src/corelib/tools/qlocale.cpp
--- qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qlocale.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/tools/qlocale.cpp	2023-10-17 14:38:05.854106100 +0800
@@ -3526,6 +3526,48 @@
     return format.arg(str, sym);
 }
 
+QString QLocale::formattedDataSize(qint64 bytes, int precision, DataSizeFormats format)
+{
+    int power, base = 1000;
+    if (!bytes) {
+        power = 0;
+    } else if (format & DataSizeBase1000) {
+        power = int(std::log10(qAbs(bytes)) / 3);
+    } else { // Compute log2(bytes) / 10:
+        power = int((63 - qCountLeadingZeroBits(quint64(qAbs(bytes)))) / 10);
+        base = 1024;
+    }
+    // Only go to doubles if we'll be using a quantifier:
+    const QString number = power
+        ? toString(bytes / std::pow(double(base), power), 'f', qMin(precision, 3 * power))
+        : toString(bytes);
+
+    // We don't support sizes in units larger than exbibytes because
+    // the number of bytes would not fit into qint64.
+    Q_ASSERT(power <= 6 && power >= 0);
+    // Red Panda C++: use hard-coded unit strings.
+    QString unit;
+    if (power > 0) {
+        if (format & DataSizeSIQuantifiers) {
+            static QString siQuantifiers[] {
+                QStringLiteral("kB"), QStringLiteral("MB"), QStringLiteral("GB"),
+                QStringLiteral("TB"), QStringLiteral("PB"), QStringLiteral("EB")
+            };
+            unit = siQuantifiers[power - 1];
+        } else {
+            static QString iecQuantifiers[] {
+                QStringLiteral("KiB"), QStringLiteral("MiB"), QStringLiteral("GiB"),
+                QStringLiteral("TiB"), QStringLiteral("PiB"), QStringLiteral("EiB")
+            };
+            unit = iecQuantifiers[power - 1];
+        }
+    } else {
+        unit = QStringLiteral("Bytes");
+    }
+
+    return number + QLatin1Char(' ') + unit;
+}
+
 /*!
     \since 4.8
 
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qlocale.h qtbase-opensource-src-5.6.3/src/corelib/tools/qlocale.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qlocale.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/tools/qlocale.h	2023-10-17 14:38:05.854106100 +0800
@@ -854,6 +854,19 @@
         CurrencyDisplayName
     };
 
+    enum DataSizeFormat {
+        // Single-bit values, for internal use.
+        DataSizeBase1000 = 1, // use factors of 1000 instead of IEC's 1024;
+        DataSizeSIQuantifiers = 2, // use SI quantifiers instead of IEC ones.
+
+        // Flags values for use in API:
+        DataSizeIecFormat = 0, // base 1024, KiB, MiB, GiB, ...
+        DataSizeTraditionalFormat = DataSizeSIQuantifiers, // base 1024, kB, MB, GB, ...
+        DataSizeSIFormat = DataSizeBase1000 | DataSizeSIQuantifiers // base 1000, kB, MB, GB, ...
+    };
+    Q_DECLARE_FLAGS(DataSizeFormats, DataSizeFormat)
+    Q_FLAG(DataSizeFormats)
+
     QLocale();
     QLocale(const QString &name);
     QLocale(Language language, Country country = AnyCountry);
@@ -955,6 +968,8 @@
     QString toCurrencyString(double, const QString &symbol = QString()) const;
     inline QString toCurrencyString(float, const QString &symbol = QString()) const;
 
+    QString formattedDataSize(qint64 bytes, int precision = 2, DataSizeFormats format = DataSizeIecFormat);
+
     QStringList uiLanguages() const;
 
     bool operator==(const QLocale &other) const;
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qstring.h qtbase-opensource-src-5.6.3/src/corelib/tools/qstring.h
--- qtbase-opensource-src-5.6.3.orig/src/corelib/tools/qstring.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/corelib/tools/qstring.h	2023-10-17 14:38:05.854106100 +0800
@@ -258,6 +258,11 @@
     const QChar operator[](uint i) const;
     QCharRef operator[](uint i);
 
+    Q_REQUIRED_RESULT inline QChar front() const { return at(0); }
+    Q_REQUIRED_RESULT inline QCharRef front();
+    Q_REQUIRED_RESULT inline QChar back() const { return at(size() - 1); }
+    Q_REQUIRED_RESULT inline QCharRef back();
+
     QString arg(qlonglong a, int fieldwidth=0, int base=10,
                 QChar fillChar = QLatin1Char(' ')) const Q_REQUIRED_RESULT;
     QString arg(qulonglong a, int fieldwidth=0, int base=10,
@@ -793,6 +798,10 @@
 
     Data *d;
 
+    friend inline bool operator==(QChar, const QString &) Q_DECL_NOTHROW;
+    friend inline bool operator< (QChar, const QString &) Q_DECL_NOTHROW;
+    friend inline bool operator> (QChar, const QString &) Q_DECL_NOTHROW;
+
     void reallocData(uint alloc, bool grow = false);
     void expand(int i);
     QString multiArg(int numArgs, const QString **args) const;
@@ -1094,6 +1103,8 @@
 { Q_ASSERT(i >= 0); return QCharRef(*this, i); }
 inline QCharRef QString::operator[](uint i)
 { return QCharRef(*this, i); }
+inline QCharRef QString::front() { return operator[](0); }
+inline QCharRef QString::back() { return operator[](size() - 1); }
 inline QString::iterator QString::begin()
 { detach(); return reinterpret_cast<QChar*>(d->data()); }
 inline QString::const_iterator QString::begin() const
@@ -1573,6 +1584,25 @@
 inline int QStringRef::compare(const QStringRef &s1, QLatin1String s2, Qt::CaseSensitivity cs)
 { return QString::compare_helper(s1.constData(), s1.length(), s2, cs); }
 
+// QChar <> QString
+inline bool operator==(QChar lhs, const QString &rhs) Q_DECL_NOTHROW
+{ return rhs.size() == 1 && lhs == rhs.front(); }
+inline bool operator< (QChar lhs, const QString &rhs) Q_DECL_NOTHROW
+{ return QString::compare_helper(&lhs, 1, rhs.data(), rhs.size()) <  0; }
+inline bool operator> (QChar lhs, const QString &rhs) Q_DECL_NOTHROW
+{ return QString::compare_helper(&lhs, 1, rhs.data(), rhs.size()) >  0; }
+
+inline bool operator!=(QChar lhs, const QString &rhs) Q_DECL_NOTHROW { return !(lhs == rhs); }
+inline bool operator<=(QChar lhs, const QString &rhs) Q_DECL_NOTHROW { return !(lhs >  rhs); }
+inline bool operator>=(QChar lhs, const QString &rhs) Q_DECL_NOTHROW { return !(lhs <  rhs); }
+
+inline bool operator==(const QString &lhs, QChar rhs) Q_DECL_NOTHROW { return   rhs == lhs; }
+inline bool operator!=(const QString &lhs, QChar rhs) Q_DECL_NOTHROW { return !(rhs == lhs); }
+inline bool operator< (const QString &lhs, QChar rhs) Q_DECL_NOTHROW { return   rhs >  lhs; }
+inline bool operator> (const QString &lhs, QChar rhs) Q_DECL_NOTHROW { return   rhs <  lhs; }
+inline bool operator<=(const QString &lhs, QChar rhs) Q_DECL_NOTHROW { return !(rhs <  lhs); }
+inline bool operator>=(const QString &lhs, QChar rhs) Q_DECL_NOTHROW { return !(rhs >  lhs); }
+
 inline int QString::localeAwareCompare(const QStringRef &s) const
 { return localeAwareCompare_helper(constData(), length(), s.constData(), s.length()); }
 inline int QString::localeAwareCompare(const QString& s1, const QStringRef& s2)
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/gui/kernel/qcursor.cpp qtbase-opensource-src-5.6.3/src/gui/kernel/qcursor.cpp
--- qtbase-opensource-src-5.6.3.orig/src/gui/kernel/qcursor.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/gui/kernel/qcursor.cpp	2023-10-17 14:38:05.869731000 +0800
@@ -471,6 +471,27 @@
     setShape(shape);
 }
 
+bool operator==(const QCursor &lhs, const QCursor &rhs) Q_DECL_NOTHROW
+{
+    if (lhs.d == rhs.d)
+        return true; // Copy or same shape
+
+    // Check pixmaps or bitmaps cache keys. Notice that having BitmapCursor
+    // shape implies either non-null pixmap or non-null bitmap and mask
+    if (lhs.shape() == Qt::BitmapCursor && rhs.shape() == Qt::BitmapCursor
+            && lhs.hotSpot() == rhs.hotSpot()) {
+        if (!lhs.d->pixmap.isNull())
+            return lhs.d->pixmap.cacheKey() == rhs.d->pixmap.cacheKey();
+
+        if (!rhs.d->pixmap.isNull())
+            return false;
+
+        return lhs.d->bm->cacheKey() == rhs.d->bm->cacheKey()
+                && lhs.d->bmm->cacheKey() == rhs.d->bmm->cacheKey();
+    }
+
+    return false;
+}
 
 /*!
     Returns the cursor shape identifier. The return value is one of
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/gui/kernel/qcursor.h qtbase-opensource-src-5.6.3/src/gui/kernel/qcursor.h
--- qtbase-opensource-src-5.6.3.orig/src/gui/kernel/qcursor.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/gui/kernel/qcursor.h	2023-10-17 14:38:05.869731000 +0800
@@ -102,9 +102,13 @@
     inline static void setPos(QScreen *screen, const QPoint &p) { setPos(screen, p.x(), p.y()); }
 
 private:
+    friend Q_GUI_EXPORT bool operator==(const QCursor &lhs, const QCursor &rhs) Q_DECL_NOTHROW;
     QCursorData *d;
 };
 
+Q_GUI_EXPORT bool operator==(const QCursor &lhs, const QCursor &rhs) Q_DECL_NOTHROW;
+inline bool operator!=(const QCursor &lhs, const QCursor &rhs) Q_DECL_NOTHROW { return !(lhs == rhs); }
+
 /*****************************************************************************
   QCursor stream functions
  *****************************************************************************/
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/gui/text/qfontmetrics.cpp qtbase-opensource-src-5.6.3/src/gui/text/qfontmetrics.cpp
--- qtbase-opensource-src-5.6.3.orig/src/gui/text/qfontmetrics.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/gui/text/qfontmetrics.cpp	2023-10-17 14:38:05.869731000 +0800
@@ -586,6 +586,17 @@
     return qRound(advance);
 }
 
+// Rdd Panda C++: forward to `width`.
+int QFontMetrics::horizontalAdvance(const QString &text, int len) const
+{
+    return width(text, len);
+}
+
+int QFontMetrics::horizontalAdvance(QChar ch) const
+{
+    return width(ch);
+}
+
 #if QT_VERSION < QT_VERSION_CHECK(6,0,0)
 /*! \obsolete
 
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/gui/text/qfontmetrics.h qtbase-opensource-src-5.6.3/src/gui/text/qfontmetrics.h
--- qtbase-opensource-src-5.6.3.orig/src/gui/text/qfontmetrics.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/gui/text/qfontmetrics.h	2023-10-17 14:38:05.869731000 +0800
@@ -86,6 +86,10 @@
     int width(const QString &, int len, int flags) const;
 
     int width(QChar) const;
+
+    int horizontalAdvance(const QString &, int len = -1) const;
+    int horizontalAdvance(QChar) const;
+
 #if QT_VERSION < QT_VERSION_CHECK(6,0,0)
     QT_DEPRECATED int charWidth(const QString &str, int pos) const;
 #endif
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/widgets/kernel/qaction.h qtbase-opensource-src-5.6.3/src/widgets/kernel/qaction.h
--- qtbase-opensource-src-5.6.3.orig/src/widgets/kernel/qaction.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/widgets/kernel/qaction.h	2023-10-18 08:45:39.996548800 +0800
@@ -84,9 +84,9 @@
                     NormalPriority = 128,
                     HighPriority = 256};
     Q_ENUM(Priority)
-    explicit QAction(QObject* parent);
-    QAction(const QString &text, QObject* parent);
-    QAction(const QIcon &icon, const QString &text, QObject* parent);
+    explicit QAction(QObject* parent = nullptr);
+    QAction(const QString &text, QObject* parent = nullptr);
+    QAction(const QIcon &icon, const QString &text, QObject* parent = nullptr);
 
     ~QAction();
 
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/widgets/kernel/qwidget.cpp qtbase-opensource-src-5.6.3/src/widgets/kernel/qwidget.cpp
--- qtbase-opensource-src-5.6.3.orig/src/widgets/kernel/qwidget.cpp	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/widgets/kernel/qwidget.cpp	2023-10-18 07:11:39.982967700 +0800
@@ -10337,6 +10337,15 @@
     d->setWindowFlags(flags);
 }
 
+void QWidget::setWindowFlag(Qt::WindowType flag, bool on)
+{
+    Q_D(QWidget);
+    if (on)
+        d->setWindowFlags(data->window_flags | flag);
+    else
+        d->setWindowFlags(data->window_flags & ~flag);
+}
+
 /*! \internal
 
     Implemented in QWidgetPrivate so that QMdiSubWindowPrivate can reimplement it.
diff --unified --recursive --text qtbase-opensource-src-5.6.3.orig/src/widgets/kernel/qwidget.h qtbase-opensource-src-5.6.3/src/widgets/kernel/qwidget.h
--- qtbase-opensource-src-5.6.3.orig/src/widgets/kernel/qwidget.h	2017-09-06 20:13:54.000000000 +0800
+++ qtbase-opensource-src-5.6.3/src/widgets/kernel/qwidget.h	2023-10-18 07:10:13.033316200 +0800
@@ -554,6 +554,7 @@
 
     void setWindowFlags(Qt::WindowFlags type);
     inline Qt::WindowFlags windowFlags() const;
+    void setWindowFlag(Qt::WindowType, bool on = true);
     void overrideWindowFlags(Qt::WindowFlags type);
 
     inline Qt::WindowType windowType() const;