Let QApplication emit paletteChanged

Only QGuiApplication would emit the signal. Untangling the duplicate
code is rather non-trivial, so left alone for now.

Fixes: QTBUG-71186
Change-Id: I4021e3b9ff39718562f4fa3a03c092436b559e9a
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

1 files changed, 6 insertions, 1 deletions

diff --git a/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp b/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp
index d2a244b762..d06baed322 100644
--- a/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp
+++ b/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp
@@ -240,6 +240,7 @@ void tst_QApplication::staticSetup()
     QVERIFY(style);
     QApplication::setStyle(style);
 
+    bool palette_changed = false;
     QPalette pal;
     QApplication::setPalette(pal);
 
@@ -247,7 +248,11 @@ void tst_QApplication::staticSetup()
     QApplication::setFont(font);*/
 
     int argc = 0;
-    QApplication app(argc, 0);
+    QApplication app(argc, nullptr);
+    QObject::connect(&app, &QApplication::paletteChanged, [&palette_changed]{ palette_changed = true; });
+    QVERIFY(!palette_changed);
+    qApp->setPalette(QPalette(Qt::red));
+    QVERIFY(palette_changed);
 }