qt5-styleplugins source patch (from OpenSUSE)

fix-build-against-qt-5.15.patch

From 335dbece103e2cbf6c7cf819ab6672c2956b17b3 Mon Sep 17 00:00:00 2001
From: Fabian Vogt <fvogt@suse.de>
Date: Thu, 28 May 2020 12:35:42 +0200
Subject: [PATCH] fix build against Qt 5.15

With 0a93db4d82c051164923a10e4382b12de9049b45 ("Unify application
palette handling between QGuiApplication and QApplication")
QApplicationPrivate::setSystemPalette is no longer used and necessary.
---
 src/plugins/styles/gtk2/qgtkstyle.cpp   | 2 ++
 src/plugins/styles/gtk2/qgtkstyle_p.cpp | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/src/plugins/styles/gtk2/qgtkstyle.cpp b/src/plugins/styles/gtk2/qgtkstyle.cpp
index 36169c9..2544593 100644
--- a/src/plugins/styles/gtk2/qgtkstyle.cpp
+++ b/src/plugins/styles/gtk2/qgtkstyle.cpp
@@ -440,7 +440,9 @@ 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());
+#endif
         QApplicationPrivate::setSystemFont(d->getThemeFont());
         d->applyCustomPaletteHash();
         if (!d->isKDE4Session())
diff --git a/src/plugins/styles/gtk2/qgtkstyle_p.cpp b/src/plugins/styles/gtk2/qgtkstyle_p.cpp
index e57b3d8..e71beb0 100644
--- a/src/plugins/styles/gtk2/qgtkstyle_p.cpp
+++ b/src/plugins/styles/gtk2/qgtkstyle_p.cpp
@@ -508,7 +508,9 @@ void QGtkStyleUpdateScheduler::updateTheme()
       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();
-- 
2.26.2