DolphinQt: Enable RTL layout

Languages/update-source-strings.sh

@@ -8,7 +8,7 @@ SRCDIR=Source
 find $SRCDIR -name '*.cpp' -o -name '*.h' -o -name '*.c' | \
 	xgettext -d dolphin-emu -s --keyword=_ --keyword=wxTRANSLATE --keyword=SuccessAlertT \
 	--keyword=PanicAlertT --keyword=PanicYesNoT --keyword=AskYesNoT --keyword=CriticalAlertT \
-	--keyword=GetStringT --keyword=_trans --keyword=tr --keyword=QT_TR_NOOP \
+	--keyword=GetStringT --keyword=_trans --keyword=tr:1,1t --keyword=tr:1,2c --keyword=QT_TR_NOOP \
 	--add-comments=i18n -p ./Languages/po -o dolphin-emu.pot -f - --package-name="Dolphin Emulator" \
 	--from-code=utf-8
 

Source/Core/DolphinQt/Translation.cpp

@@ -10,6 +10,7 @@
 #include <algorithm>
 #include <cstring>
 #include <iterator>
+#include <string>
 
 #include "Common/File.h"
 #include "Common/FileUtil.h"
@@ -213,7 +214,17 @@ class MoTranslator : public QTranslator
   QString translate(const char* context, const char* source_text,
                     const char* disambiguation = nullptr, int n = -1) const override
   {
-    return QString::fromUtf8(m_mo_file.Translate(source_text));
+    if (disambiguation)
+    {
+      std::string combined_string = disambiguation;
+      combined_string += '\4';
+      combined_string += source_text;
+      return QString::fromUtf8(m_mo_file.Translate(combined_string.c_str()));
+    }
+    else
+    {
+      return QString::fromUtf8(m_mo_file.Translate(source_text));
+    }
   }
 
 private:
@@ -291,6 +302,17 @@ static bool TryInstallTranslator(const QString& exact_language_code)
 
 void Translation::Initialize()
 {
+// Let the translation select the GUI directionality. This is intentionally excluded
+// from compilation, since all that matters is that xgettext sees it. We could use
+// QT_TRANSLATE_NOOP3 instead of tr, but that doesn't compile correctly when put
+// on a line of its own, so we would need to exclude it from compilation anyway.
+#if 0
+  QGuiApplication::tr(
+      "QT_LAYOUT_DIRECTION",
+      "Translate this string to the string 'LTR' in left-to-right languages or to 'RTL' in "
+      "right-to-left languages (such as Hebrew and Arabic) to get proper widget layout.");
+#endif
+
   // Hook up Dolphin internal translation
   Common::RegisterStringTranslator(
       [](const char* text) { return QObject::tr(text).toStdString(); });