added convertToLanguageTypeWithFallback()

Change-Id: Ib57a7c6fc57192b4a615f5ad0e43c580769513e9

i18nlangtag/source/languagetag/languagetag.cxx

@@ -1633,4 +1633,11 @@ LanguageType LanguageTag::convertToLanguageType( const OUString& rBcp47, bool bR
     return LanguageTag( rBcp47).getLanguageType( bResolveSystem);
 }
 
+
+// static
+LanguageType LanguageTag::convertToLanguageTypeWithFallback( const OUString& rBcp47 )
+{
+    return LanguageTag( rBcp47).makeFallback().getLanguageType( true);
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

include/i18nlangtag/languagetag.hxx

@@ -435,6 +435,19 @@ public:
      */
     static LanguageType convertToLanguageType( const OUString& rBcp47, bool bResolveSystem = true );
 
+    /** Convert BCP 47 string to MS-LangID with fallback, convenience method.
+
+        NOTE: exists only for consistency with the other convertTo...()
+        methods, internally uses a temporary LanguageTag instance for
+        conversion so does not save anything compared to
+        LanguageTag(rBcp47).makeFallback().getLanguageType(bResolveSystem).
+
+        @see    makeFallback()
+
+        Always resolves an empty tag to the system locale.
+     */
+    static LanguageType convertToLanguageTypeWithFallback( const OUString& rBcp47 );
+
 private:
 
     enum Decision