Use brilliant workaround to show Windows 10 top border

Sine Striker

2023-12-24 46285db399f75154ad6c451e12f2cae2e59ace25

 src/core/shared/qwkwindowsextra_p.h

@@ -16,11 +16,12 @@

#include <QWKCore/qwindowkit_windows.h>

#include <QtGui/QStyleHints>
#include <QtGui/QPalette>

#include <QtCore/private/qsystemlibrary_p.h>
#include <QtCore/private/qwinregistry_p.h>

#include <QtGui/QGuiApplication>
#include <QtGui/QStyleHints>
#include <QtGui/QPalette>

// Don't include this header in any header files.

@@ -131,7 +132,24 @@
    };
    using PWINDOWCOMPOSITIONATTRIBDATA = WINDOWCOMPOSITIONATTRIBDATA *;

    enum PREFERRED_APP_MODE
    {
        PAM_DEFAULT = 0, // Default behavior on systems before Win10 1809. It indicates the application doesn't support dark mode at all.
        PAM_AUTO = 1, // Available since Win10 1809, let system decide whether to enable dark mode or not.
        PAM_DARK = 2, // Available since Win10 1903, force dark mode regardless of the system theme.
        PAM_LIGHT = 3, // Available since Win10 1903, force light mode regardless of the system theme.
        PAM_MAX = 4
    };

    using SetWindowCompositionAttributePtr = BOOL(WINAPI *)(HWND, PWINDOWCOMPOSITIONATTRIBDATA);

    // Win10 1809 (10.0.17763)
    using RefreshImmersiveColorPolicyStatePtr = VOID(WINAPI *)(VOID); // Ordinal 104
    using AllowDarkModeForWindowPtr = BOOL(WINAPI *)(HWND, BOOL); // Ordinal 133
    using AllowDarkModeForAppPtr = BOOL(WINAPI *)(BOOL); // Ordinal 135
    using FlushMenuThemesPtr = VOID(WINAPI *)(VOID); // Ordinal 136
    // Win10 1903 (10.0.18362)
    using SetPreferredAppModePtr = PREFERRED_APP_MODE(WINAPI *)(PREFERRED_APP_MODE); // Ordinal 135

    namespace {

@@ -160,6 +178,11 @@
#undef DYNAMIC_API_DECLARE

            SetWindowCompositionAttributePtr pSetWindowCompositionAttribute = nullptr;
            RefreshImmersiveColorPolicyStatePtr pRefreshImmersiveColorPolicyState = nullptr;
            AllowDarkModeForWindowPtr pAllowDarkModeForWindow = nullptr;
            AllowDarkModeForAppPtr pAllowDarkModeForApp = nullptr;
            FlushMenuThemesPtr pFlushMenuThemes = nullptr;
            SetPreferredAppModePtr pSetPreferredAppMode = nullptr;

        private:
            DynamicApis() {
@@ -189,6 +212,18 @@
                DYNAMIC_API_RESOLVE(winmm, timeEndPeriod);

#undef DYNAMIC_API_RESOLVE

#define UNDOC_API_RESOLVE(DLL, NAME, ORDINAL)                                                             \
    p##NAME = reinterpret_cast<decltype(p##NAME)>(DLL.resolve(MAKEINTRESOURCEA(ORDINAL)))

                QSystemLibrary uxtheme(QStringLiteral("uxtheme"));
                UNDOC_API_RESOLVE(uxtheme, RefreshImmersiveColorPolicyState, 104);
                UNDOC_API_RESOLVE(uxtheme, AllowDarkModeForWindow, 133);
                UNDOC_API_RESOLVE(uxtheme, AllowDarkModeForApp, 135);
                UNDOC_API_RESOLVE(uxtheme, FlushMenuThemes, 136);
                UNDOC_API_RESOLVE(uxtheme, SetPreferredAppMode, 135);

#undef UNDOC_API_RESOLVE
            }

            ~DynamicApis() = default;
@@ -293,6 +328,16 @@
        return result;
    }

    static inline bool isWin101809OrGreater() {
        static const bool result = IsWindows101809OrGreater_Real();
        return result;
    }

    static inline bool isWin101903OrGreater() {
        static const bool result = IsWindows101903OrGreater_Real();
        return result;
    }

    static inline bool isWin11OrGreater() {
        static const bool result = IsWindows11OrGreater_Real();
        return result;
@@ -327,6 +372,13 @@
        return value.first;
    }

    static inline bool isHighContrastModeEnabled() {
        HIGHCONTRASTW hc{};
        hc.cbSize = sizeof(hc);
        ::SystemParametersInfoW(SPI_GETHIGHCONTRAST, sizeof(hc), &hc, FALSE);
        return (hc.dwFlags & HCF_HIGHCONTRASTON);
    }

    static inline bool isDarkThemeActive() {
#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
        return QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark;
@@ -354,9 +406,8 @@
                                                         _DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1,
                                                         &enabled, sizeof(enabled)))) {
            return enabled;
        } else {
            return false;
        }
        return false;
    }

    static inline QColor getAccentColor() {