better default settings file name handling

ChangeLog

@@ -4,10 +4,14 @@
 
 3.5.8git
 
+TODO bug fix: incorrect selection of UI language (#408)
+
 TODO improve settings management -> move settings class in client/server classes, move actual settings variables
 
 TODO add new register message which contains version and, e.g., max number of clients
 
+TODO bug fix: grouping faders in the client should be proportional (see discussion in #202)
+
 TODO https://github.com/corrados/jamulus/issues/341#issuecomment-647172946
      - generate .qm on compile time with lrelease
 

src/settings.cpp

@@ -36,6 +36,7 @@ void CSettings::Load()
     // prepare file name for loading initialization data from XML file and read
     // data from file if possible
     QFile file ( strFileName );
+
     if ( file.open ( QIODevice::ReadOnly ) )
     {
         QTextStream in ( &file );
@@ -690,11 +691,13 @@ void CSettings::Save()
 
 
 // Help functions **************************************************************
-void CSettings::SetFileName ( const QString& sNFiName )
+void CSettings::SetFileName ( const QString& sNFiName,
+                              const QString& sDefaultFileName )
 {
     // return the file name with complete path, take care if given file name is
     // empty
     strFileName = sNFiName;
+
     if ( strFileName.isEmpty() )
     {
         // we use the Qt default setting file paths for the different OSs by
@@ -713,14 +716,7 @@ void CSettings::SetFileName ( const QString& sNFiName )
         }
 
         // append the actual file name
-        if ( bIsClient )
-        {
-            strFileName = sConfigDir + "/" + DEFAULT_INI_FILE_NAME;
-        }
-        else
-        {
-            strFileName = sConfigDir + "/" + DEFAULT_INI_FILE_NAME_SERVER;
-        }
+        strFileName = sConfigDir + "/" + sDefaultFileName;
     }
 }
 

src/settings.h

@@ -40,18 +40,19 @@ class CSettings
 {
 public:
     CSettings ( CClient* pNCliP, const QString& sNFiName ) :
-        pClient ( pNCliP ), bIsClient ( true )
-        { SetFileName ( sNFiName ); }
+        pClient ( pNCliP ), bIsClient ( true ), strFileName ( "" )
+        { SetFileName ( sNFiName, DEFAULT_INI_FILE_NAME ); }
 
     CSettings ( CServer* pNSerP, const QString& sNFiName ) :
-        pServer ( pNSerP ), bIsClient ( false )
-        { SetFileName ( sNFiName ); }
+        pServer ( pNSerP ), bIsClient ( false ), strFileName ( "" )
+        { SetFileName ( sNFiName, DEFAULT_INI_FILE_NAME_SERVER); }
 
     void Load();
     void Save();
 
 protected:
-    void SetFileName ( const QString& sNFiName );
+    void SetFileName ( const QString& sNFiName,
+                       const QString& sDefaultFileName );
 
     // The following functions implement the conversion from the general string
     // to base64 (which should be used for binary data in XML files). This