Work around layouting issue for RTL languages

This has been fixed in the meanwhile, but we are still shipping
with Qt 5.4. Also, some Linux Distros will still have older Qt
versions.

Addresses issue #4301

diff --git a/src/gui/application.cpp b/src/gui/application.cpp
index f347020bb59e1a3d21a8e68713aea96762d5a0f3..301856e8905d2b5a2c4c0a7a77d6c67ee07d557d 100644 (file)
--- a/src/gui/application.cpp
+++ b/src/gui/application.cpp
@@ -570,6 +570,10 @@ void Application::setupTranslations()
         if (property("ui_lang").isNull())
             setProperty("ui_lang", "C");
     }
+// Work around Qt 5 < 5.5.0 regression, see https://bugreports.qt.io/browse/QTBUG-43447
+#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0) && QT_VERSION < QT_VERSION_CHECK(5, 5, 0)
+    setLayoutDirection(QApplication::tr("QT_LAYOUT_DIRECTION") == QLatin1String("RTL") ? Qt::RightToLeft : Qt::LeftToRight);
+#endif
 }
 
 bool Application::giveHelp()