When warning about invalid style override also print available ones

Change-Id: Ia017a342648a1f1e1185e74ddec1a77cb6dcfebe
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp
index 2410daf047..f9db6155af 100644
--- a/src/widgets/kernel/qapplication.cpp
+++ b/src/widgets/kernel/qapplication.cpp
@@ -1064,8 +1064,10 @@ QStyle *QApplication::style()
         if (!QApplicationPrivate::styleOverride.isEmpty()) {
             const QString style = QApplicationPrivate::styleOverride.toLower();
             app_style = QStyleFactory::create(style);
-            if (!app_style)
-                qWarning("QApplication: invalid style override passed, ignoring it.");
+            if (Q_UNLIKELY(!app_style)) {
+                qWarning("QApplication: invalid style override passed, ignoring it.\n"
+                "    Available styles: %s", qPrintable(QStyleFactory::keys().join(QLatin1String(", "))));
+            }
         }
         if (!app_style)
             app_style = QStyleFactory::create(QApplicationPrivate::desktopStyleKey());