Description: fix build against Qt 5.15
 With 0a93db4d82c051164923a10e4382b12de9049b45
 ("Unify application palette handling between QGuiApplication and QApplication")
 QApplicationPrivate::setSystemPalette does no longer exist.
 .
 This style does explicitly not support "system colors" defined by the platform
 theme, which have priority over the style provided palette. To prevent the
 theme from overriding the colors, it previously used the system palette
 mechanism (which has priority over the theme), but that way does not work
 anymore. Instead, simply use QApplication::setPalette. While that has
 different behaviour and might break in some applications, it's better than
 having a completely messed up palette with certain themes.
 .
 This is the same change as suggested by gamezelda on
 https://aur.archlinux.org/packages/qt5-styleplugins/#comment-749190.
Origin: openSUSE, https://build.opensuse.org/package/view_file/KDE:Qt:5.15/libqt5-qtstyleplugins/fix-build-qt5.15.patch?expand=1
Last-Update: 2020-10-13

--- a/src/plugins/styles/gtk2/qgtkstyle.cpp
+++ b/src/plugins/styles/gtk2/qgtkstyle.cpp
@@ -440,7 +440,11 @@ void QGtkStyle::polish(QApplication *app
     // not supported as these should be entirely determined by
     // current Gtk settings
     if (app->desktopSettingsAware() && d->isThemeAvailable()) {
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
         QApplicationPrivate::setSystemPalette(standardPalette());
+#else
+        QApplication::setPalette(standardPalette());
+#endif
         QApplicationPrivate::setSystemFont(d->getThemeFont());
         d->applyCustomPaletteHash();
         if (!d->isKDE4Session())
--- a/src/plugins/styles/gtk2/qgtkstyle_p.cpp
+++ b/src/plugins/styles/gtk2/qgtkstyle_p.cpp
@@ -508,7 +508,9 @@ void QGtkStyleUpdateScheduler::updateThe
       if (oldTheme != QGtkStylePrivate::getThemeName()) {
           oldTheme = QGtkStylePrivate::getThemeName();
           QPalette newPalette = qApp->style()->standardPalette();
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
           QApplicationPrivate::setSystemPalette(newPalette);
+#endif
           QApplication::setPalette(newPalette);
           if (!QGtkStylePrivate::instances.isEmpty()) {
               QGtkStylePrivate::instances.last()->initGtkWidgets();